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Update and rename isPromise.md to isPromiseLike.md

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Angelos Chalaris
2017-12-31 14:25:43 +02:00
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commit be3f67971f
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snippets/isPromise.md → snippets/isPromiseLike.md
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### isPromise ### isPromiseLike
Returns `true` if an object looks like a [`Promise`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise), `false` otherwise. Returns `true` if an object looks like a [`Promise`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise), `false` otherwise.
Check if the object is not `null`, its `typeof` matches either `object` or `function` and if it has a `.then` property, which is also a `function`. Check if the object is not `null`, its `typeof` matches either `object` or `function` and if it has a `.then` property, which is also a `function`.
```js ```js
const isPromise = obj => const isPromiseLike = obj =>
obj !== null && (typeof obj === 'object' || typeof obj === 'function') && typeof obj.then === 'function'; obj !== null && (typeof obj === 'object' || typeof obj === 'function') && typeof obj.then === 'function';
``` ```
```js ```js
isPromise({then:function () {return ''}}); // true isPromiseLike({then:function () {return ''}}); // true
isPromise(null); // false isPromiseLike(null); // false
isPromise({}); // false isPromiseLike({}); // false
``` ```