Update flatten.md
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@ -5,7 +5,7 @@ Flattens an array up to the specified depth.
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Use recursion, decrementing `depth` by 1 for each level of depth.
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Use recursion, decrementing `depth` by 1 for each level of depth.
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Use `Array.reduce()` and `Array.concat()` to merge elements or arrays.
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Use `Array.reduce()` and `Array.concat()` to merge elements or arrays.
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Base case, for `depth` equal to `1` stops recursion.
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Base case, for `depth` equal to `1` stops recursion.
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Omit the second element, `depth` to flatten only to a depth of `1` (single flatten).
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Omit the second argument, `depth` to flatten only to a depth of `1` (single flatten).
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```js
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```js
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const flatten = (arr, depth = 1) =>
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const flatten = (arr, depth = 1) =>
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