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Bruce Eckel
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@ -1,8 +1,8 @@
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## Operations on Collections (#4)
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`all()`, `none()` and `any()` can be used to produce identical results.
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Implement the `List<Int>` extension functions `allNonZero()` and `hasZero()`
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using each of `all()`, `none()` and `any()`.
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Implement `List<Int>` extension functions `allNonZero()` and `hasZero()` using
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each of `all()`, `none()` and `any()`.
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- `allNonZero()` checks that all elements in the list are non-zero.
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@ -10,4 +10,8 @@ using each of `all()`, `none()` and `any()`.
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The implementations using `all()` are given in the starter code.
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Hint: You can negate the results of `all()`, `none()` or `any()`.
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<div class="hint">
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You can negate the results of `all()`, `none()` or `any()`.
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</div>
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@ -9,9 +9,8 @@ class Delegator {
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}
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```
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Define `getValue()` and `setValue()` as extension functions to `List<String>`
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(Hint: IntelliJ IDEA will generate skeletons for you). The code in `main()`
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will test your solution.
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Define `getValue()` and `setValue()` as extension functions to `List<String>`.
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The code in `main()` will test your solution.
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BONUS: Try adjusting `getValue()` and `setValue()` to work with:
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@ -23,6 +22,12 @@ class Delegator {
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And explain what happens.
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<sub> This task doesn't contain the automatic tests,
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it's always marked as "Correct" on "Check".
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Please compare your solution with the provided one! </sub>
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<div class="hint">
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IntelliJ IDEA will generate skeletons for you.
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</div>
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<sub> This task doesn't contain automatic tests, so
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it's always marked as "Correct" when you run "Check".
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Please compare your solution to the one provided! </sub>
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@ -2,4 +2,4 @@
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Define `var x = 1`. Now define `val y = x` and `val z = y`. Next, assign
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2 to `x` and display the values of all three identifiers on different lines:
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first `x`, then `y`, then `z`.
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first `x`, then `y`, then `z`.
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@ -11,4 +11,4 @@ filled with sequential numbers in a form of snake. For example, `showSnake(3,
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```
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For proper alignment, use `"%3d".format(number)` to place any necessary spaces
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before the number.
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before the number.
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@ -2,4 +2,4 @@
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Create a function `other()` that takes a `String` parameter and returns a
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`String` containing every other letter of the parameter. For example, the
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argument "cement" produces "cmn".
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argument "cement" produces "cmn".
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@ -9,4 +9,4 @@ parameters. In `main()`, display the result of combining `first()` and
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| `first()` Arguments | `second()` Arguments |
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|---------------------|----------------------|
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| true, true, true | false, false, false |
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| true, false, true | false, true, false |
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| true, false, true | false, true, false |
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@ -1,7 +1,7 @@
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## Summary 1 (#4)
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This exercise modifies `Overflow.kt` to test `Long` and `Double`. Implement
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`testLong()` to display the `Long` maximum value incremented by `1`. Make
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`testLong()` to display `Long`'s maximum value incremented by `1`. Make
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`testDouble()` display the `Double` maximum value incremented by `1`. Make
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`testDouble2()` display the result of comparing `Double.MAX_VALUE` and
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`Double.MAX_VALUE + 1`.
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`Double.MAX_VALUE + 1`.
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@ -1,4 +1,4 @@
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## Summary 1 (#5)
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Implement `everyFifth()` to display every fifth number in the given range. For
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example, `everyFifth(11, 30)` displays the numbers `15`, `20`, `25`, and `30`.
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example, `everyFifth(11, 30)` displays the numbers `15`, `20`, `25`, and `30`.
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@ -2,5 +2,5 @@
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Implement `everyFifthNonWhitespace()` to display every fifth non-whitespace
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character in the given text. For example, `everyFifthNonWhitespace("abc d e fgh
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ik")` displays the characters `e` (fifth character if not counting
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whitespaces) and `k` (tenth).
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ik")` displays the characters `e` (the fifth character if not counting
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whitespaces) and `k` (the tenth).
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@ -20,4 +20,4 @@ in `121341`:
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| - | 121341 | 3 |
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The "Removed" values are in the table for clarity, but you don't need a
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"Removed" variable in your solution.
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"Removed" variable in your solution.
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@ -9,4 +9,4 @@ Reverse the digits in a decimal number using a `while` loop. An auxiliary
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| 123 | 4 |
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| 12 | 43 |
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| 1 | 432 |
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| 0 | 4321 |
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| 0 | 4321 |
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@ -10,4 +10,4 @@ following:
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#######
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#########
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###########
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```
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```
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@ -2,4 +2,4 @@
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Create a `String` by iterating over a range of characters that you define. The
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resulting `String` should contain all English letters in alphabetical order:
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"abc...z".
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"abc...z".
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@ -1,4 +1,4 @@
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## The `in` Keyword (#2)
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Use `step` to write a function that sums only even numbers up to a given
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number (the parameter).
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Use `step` to write a function that sums only even numbers, up to a given
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number (the parameter).
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@ -6,4 +6,4 @@ Write a function that checks whether a character is a lowercase letter.
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Test to see whether its code is between the codes for `a` and `z`.
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</div>
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</div>
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@ -4,4 +4,8 @@ Write a function that checks whether its `String` parameter is a valid
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identifier. A valid identifier is a non-empty `String` that starts with a letter
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or underscore and consists of only letters, digits and underscores.
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Use `s.isEmpty()` to check whether `s` is an empty `String`.
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<div class="hint">
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Use `s.isEmpty()` to check whether `s` is an empty `String`.
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</div>
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@ -1,7 +1,7 @@
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## Mastering the IDE: `main` Live Template
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`main` is another useful live template, which unfolds the `main()` function
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declaration for you automatically. Type `main`, and then press
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<span class="shortcut">&shortcut:ExpandLiveTemplateByTab;</span>. Then call
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the `foo()` function from `main()` and run `main()` (do you remember the
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shortcut for that?).
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The `main` live template automatically produces the `main()` function
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declaration. Type `main`, and then press <span
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class="shortcut">&shortcut:ExpandLiveTemplateByTab;</span>. Call the `foo()`
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function from `main()` and run `main()` (do you remember the shortcut for
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that?).
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@ -1,5 +1,5 @@
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## `var` & `val` (#1)
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Define a `val answer` and set its value to `42`. On the next line, try to
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Define `val answer` and initialize it to `42`. On the next line, try to
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reassign `answer` to `43`. What error does Kotlin produce? Fix the error by
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replacing `val` with `var`. Display the value of `answer` on the console.
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replacing `val` with `var`. Display the value of `answer` on the console.
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@ -1,4 +1,4 @@
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## `var` & `val` (#2)
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Define `var a = 10`. Now define a `val b = a`. Now assign `42` to `a` and
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display both `a` and `b` on different lines.
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Define `var a = 10` and a `val b = a`. Now assign `42` to `a` and
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display both `a` and `b` on different lines.
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@ -12,11 +12,10 @@ println(y) // 1
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```
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Your code should remain unchanged for different initializers, like `var x =
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"first"`, `var y = "second"`. Thus, using `x = 2`, `y = 1` is not the expected
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solution.
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"first"`, `var y = "second"`.
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<div class="hint">
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You may need to introduce a third auxiliary `val`.
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</div>
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</div>
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@ -3,11 +3,11 @@
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The <span class="control">`Project`</span> window showing the course structure
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on the left and <span class="control">`Task description`</span> window on the
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right are called *tool windows*. You can adjust their size by clicking on the
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boundary and moving it. You can hide the tool window from the view temporarily
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boundary and moving it. You can temporarily hide the tool window from the view
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to make better use of the screen: click the "hide" button (the one with an
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arrow) at the top right corner of the tool window. To see it again, choose
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its name by clicking on the right or left side of the screen or by choosing it
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arrow) at the top right corner of the tool window. To see it again, choose
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its name by clicking on the right or left side of the screen or by choosing it
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in the <span class="control">`View | Tool Windows`</span> application menu.
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Hide the <span class="control">`Task description`</span> tool window and
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then open it again.
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then open it again.
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@ -1,16 +1,15 @@
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## Mastering the IDE: Project Tool Window
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The icons at the top of the <span class="control">`Project`</span> Tool Window
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allow to perform several convenient operations.
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For example, you can locate the currently opened file in the
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<span class="control">`Project`</span> Tool Window by clicking on the
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<span class="control">`Scroll from Source`</span> icon.
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perform several convenient operations. For example, you can locate the
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currently opened file in the <span class="control">`Project`</span> Tool Window
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by clicking on the <span class="control">`Scroll from Source`</span> icon.
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Alternatively, press <span class="shortcut">&shortcut:SelectIn;</span> or choose
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You can also press <span class="shortcut">&shortcut:SelectIn;</span> or choose
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<span class="control">`Navigate | Select in...`</span> from the menu above.
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Then choose <span class="control">`Project View`</span> in the open menu.
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Press the <span class="control">`Collapse All`</span> button on the
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<span class="control">`Project`</span> Tool Window to hide all the
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project content, then open the current file by trying all the options listed
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above.
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project content, then open the current file by trying the options listed
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above.
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@ -1,6 +1,6 @@
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## `break` & `continue` (#1)
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Implement a function `readNumbers()` that reads user input in an infinite loop.
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When the user enters zero, it `break`s from the loop and prints the sum of the
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entered numbers. If the user enters a non-number, it prints "Not a number:
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$input" and goes back to accepting input.
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When the user enters zero, it `break`s from the loop and displays the sum of
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the entered numbers. If the user enters a non-number, it displays "Not a
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number: $input" and goes back to accepting input.
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@ -2,17 +2,17 @@
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Complete the implementation of the functions `analyzeStrings1()` and
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`analyzeStrings2()` provided in the starter code. Each function takes a
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`List<List<String>>` as an argument and displays its contents to the console.
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If a `String` is the word `"stop"`, don't display any more elements from the
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current (inner) `List`. The code in `analyzeStrings1()` uses `break`, while
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`analyzeStrings2()` uses `continue`. Add the missing labels for `break` and
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`continue`.
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parameter which is a `List<List<String>>` and displays its contents to the
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console. If a `String` is the word `"stop"`, don't display any more elements
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from the current (inner) `List`. The code in `analyzeStrings1()` uses `break`,
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while `analyzeStrings2()` uses `continue`. Add the missing labels for `break`
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and `continue`.
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Now rewrite `analyzeStrings1()` without using labels.
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<div class="hint">
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You can remove all the labels from `analyzeStrings1()` and `break` will
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jump from the closest inner loop, so this loop doesn't need labels.
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jump from the closest inner loop, so that loop doesn't need labels.
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</div>
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</div>
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