14 lines
248 B
Markdown
14 lines
248 B
Markdown
### flatten
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Flattens an array.
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Use a new array and concatenate it with the spread input array causing a shallow denesting of any contained arrays.
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```js
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const flatten = arr => [ ].concat(...arr);
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```
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```js
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flatten([1,[2],3,4]) // [1,2,3,4]
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```
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