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124 lines
2.3 KiB
Markdown
124 lines
2.3 KiB
Markdown
---
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id: af2170cad53daa0770fabdea
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title: Mutations
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challengeType: 1
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forumTopicId: 16025
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dashedName: mutations
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---
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# --description--
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Return `true` if the string in the first element of the array contains all of the letters of the string in the second element of the array.
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For example, `["hello", "Hello"]`, should return `true` because all of the letters in the second string are present in the first, ignoring case.
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The arguments `["hello", "hey"]` should return `false` because the string `hello` does not contain a `y`.
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Lastly, `["Alien", "line"]`, should return `true` because all of the letters in `line` are present in `Alien`.
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# --hints--
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`mutation(["hello", "hey"])` should return `false`.
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```js
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assert.isFalse(mutation(['hello', 'hey']));
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```
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`mutation(["hello", "Hello"])` should return `true`.
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```js
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assert.isTrue(mutation(['hello', 'Hello']));
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```
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`mutation(["zyxwvutsrqponmlkjihgfedcba", "qrstu"])` should return `true`.
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```js
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assert.isTrue(mutation(['zyxwvutsrqponmlkjihgfedcba', 'qrstu']));
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```
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`mutation(["Mary", "Army"])` should return `true`.
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```js
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assert.isTrue(mutation(['Mary', 'Army']));
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```
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`mutation(["Mary", "Aarmy"])` should return `true`.
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```js
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assert.isTrue(mutation(['Mary', 'Aarmy']));
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```
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`mutation(["Alien", "line"])` should return `true`.
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```js
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assert.isTrue(mutation(['Alien', 'line']));
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```
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`mutation(["floor", "for"])` should return `true`.
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```js
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assert.isTrue(mutation(['floor', 'for']));
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```
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`mutation(["hello", "neo"])` should return `false`.
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```js
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assert.isFalse(mutation(['hello', 'neo']));
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```
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`mutation(["voodoo", "no"])` should return `false`.
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```js
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assert.isFalse(mutation(['voodoo', 'no']));
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```
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`mutation(["ate", "date"])` should return `false`.
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```js
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assert.isFalse(mutation(['ate', 'date']));
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```
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`mutation(["Tiger", "Zebra"])` should return `false`.
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```js
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assert.isFalse(mutation(['Tiger', 'Zebra']));
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```
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`mutation(["Noel", "Ole"])` should return `true`.
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```js
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assert.isTrue(mutation(['Noel', 'Ole']));
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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 mutation(arr) {
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return arr;
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}
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mutation(['hello', 'hey']);
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```
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# --solutions--
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```js
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function mutation(arr) {
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let hash = Object.create(null);
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arr[0]
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.toLowerCase()
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.split('')
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.forEach(c => (hash[c] = true));
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return !arr[1]
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.toLowerCase()
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.split('')
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.filter(c => !hash[c]).length;
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}
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mutation(['hello', 'hey']);
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```
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