98 lines
1.4 KiB
Markdown
98 lines
1.4 KiB
Markdown
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---
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id: a77dbc43c33f39daa4429b4f
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title: Boo who
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challengeType: 5
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forumTopicId: 16000
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dashedName: boo-who
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---
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# --description--
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Check if a value is classified as a boolean primitive. Return `true` or `false`.
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Boolean primitives are `true` and `false`.
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# --hints--
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`booWho(true)` should return `true`.
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```js
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assert.strictEqual(booWho(true), true);
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```
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`booWho(false)` should return `true`.
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```js
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assert.strictEqual(booWho(false), true);
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```
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`booWho([1, 2, 3])` should return `false`.
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```js
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assert.strictEqual(booWho([1, 2, 3]), false);
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```
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`booWho([].slice)` should return `false`.
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```js
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assert.strictEqual(booWho([].slice), false);
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```
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`booWho({ "a": 1 })` should return `false`.
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```js
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assert.strictEqual(booWho({ a: 1 }), false);
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```
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`booWho(1)` should return `false`.
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```js
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assert.strictEqual(booWho(1), false);
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```
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`booWho(NaN)` should return `false`.
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```js
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assert.strictEqual(booWho(NaN), false);
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```
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`booWho("a")` should return `false`.
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```js
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assert.strictEqual(booWho('a'), false);
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```
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`booWho("true")` should return `false`.
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```js
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assert.strictEqual(booWho('true'), false);
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```
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`booWho("false")` should return `false`.
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```js
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assert.strictEqual(booWho('false'), false);
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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 booWho(bool) {
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return bool;
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}
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booWho(null);
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```
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# --solutions--
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```js
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function booWho(bool) {
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return typeof bool === "boolean";
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}
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booWho(null);
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```
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