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add description to array includes snippet since it looks a lot like es6 native includes function.

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iamsoorena
2017-12-15 23:16:18 +03:30
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snippets/array-includes.md
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@ -3,6 +3,7 @@
Use `slice()` to offset the array/string and `indexOf()` to check if the value is included. Use `slice()` to offset the array/string and `indexOf()` to check if the value is included.
Omit the last argument, `fromIndex`, to check the whole array/string. Omit the last argument, `fromIndex`, to check the whole array/string.
In [ES6](http://www.ecma-international.org/ecma-262/7.0/#sec-array.prototype.includes), you can use a similar native `.includes()` function.
```js ```js
const includes = (collection, val, fromIndex=0) => collection.slice(fromIndex).indexOf(val) != -1; const includes = (collection, val, fromIndex=0) => collection.slice(fromIndex).indexOf(val) != -1;
// includes("30-seconds-of-code", "code") -> true // includes("30-seconds-of-code", "code") -> true