117 lines
3.0 KiB
Markdown
117 lines
3.0 KiB
Markdown
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---
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id: 5a23c84252665b21eecc7ffe
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title: 複合構造の配列をソートする
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challengeType: 5
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forumTopicId: 302306
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dashedName: sort-an-array-of-composite-structures
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---
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# --description--
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パラメータとしてオブジェクトの配列を取る関数を記述してください。 関数は、オブジェクトの 'key' 属性に従って配列をソートし、ソートされた配列を返す必要があります。
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# --hints--
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`sortByKey` は関数とします。
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```js
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assert(typeof sortByKey == 'function');
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```
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`sortByKey([{key: 3, value: "foo"}, {key: 2, value: "bar"}, {key: 4, value: "baz"}, {key: 1, value: 42}, {key: 5, value: "another string"}])` は配列を返す必要があります。
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```js
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assert(
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Array.isArray(
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sortByKey([
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{ key: 3, value: 'foo' },
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{ key: 2, value: 'bar' },
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{ key: 4, value: 'baz' },
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{ key: 1, value: 42 },
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{ key: 5, value: 'another string' }
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])
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)
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);
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```
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`sortByKey([{key: 3, value: "foo"}, {key: 2, value: "bar"}, {key: 4, value: "baz"}, {key: 1, value: 42}, {key: 5, value: "another string"}])` は `[{key: 1, value: 42}, {key: 2, value: "bar"}, {key: 3, value: "foo"}, {key: 4, value: "baz"}, {key: 5, value: "another string"}]` を返す必要があります。
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```js
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assert.deepEqual(
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sortByKey([
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{ key: 3, value: 'foo' },
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{ key: 2, value: 'bar' },
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{ key: 4, value: 'baz' },
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{ key: 1, value: 42 },
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{ key: 5, value: 'another string' }
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]),
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[
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{ key: 1, value: 42 },
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{ key: 2, value: 'bar' },
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{ key: 3, value: 'foo' },
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{ key: 4, value: 'baz' },
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{ key: 5, value: 'another string' }
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]
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);
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```
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`sortByKey([{key: 3, name: "Joe"}, {key: 4, name: "Bill"}, {key: 20, name: "Alice"}, {key: 5, name: "Harry"}])` は `[{key: 3, name: "Joe"}, {key: 4, name: "Bill"}, {key: 5, name: "Harry"}, {key: 20, name: "Alice"}]` を返す必要があります。
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```js
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assert.deepEqual(
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sortByKey([
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{ key: 3, name: 'Joe' },
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{ key: 4, name: 'Bill' },
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{ key: 20, name: 'Alice' },
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{ key: 5, name: 'Harry' }
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]),
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[
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{ key: 3, name: 'Joe' },
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{ key: 4, name: 'Bill' },
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{ key: 5, name: 'Harry' },
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{ key: 20, name: 'Alice' }
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]
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);
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```
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`sortByKey([{key: 2341, name: "Adam"}, {key: 122, name: "Bernie"}, {key: 19, name: "David"}, {key: 5531, name: "Joe"}, {key: 1234, name: "Walter"}])` は `[{key: 19, name: "David"}, {key: 122, name: "Bernie"}, {key: 1234, name: "Walter"}, {key: 2341, name: "Adam"}, {key: 5531, name: "Joe"}]` を返す必要があります。
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```js
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assert.deepEqual(
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sortByKey([
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{ key: 2341, name: 'Adam' },
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{ key: 122, name: 'Bernie' },
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{ key: 19, name: 'David' },
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{ key: 5531, name: 'Joe' },
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{ key: 1234, name: 'Walter' }
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]),
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[
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{ key: 19, name: 'David' },
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{ key: 122, name: 'Bernie' },
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{ key: 1234, name: 'Walter' },
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{ key: 2341, name: 'Adam' },
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{ key: 5531, name: 'Joe' }
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]
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);
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```
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# --seed--
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## --seed-contents--
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```js
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function sortByKey(arr) {
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}
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```
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# --solutions--
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```js
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function sortByKey (arr) {
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return arr.sort(function(a, b) {
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return a.key - b.key
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});
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}
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```
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