25 lines
837 B
Markdown
25 lines
837 B
Markdown
---
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title: toPairs
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tags: object,array,intermediate
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---
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Creates an array of key-value pair arrays from an object or other iterable.
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- Check if `Symbol.iterator` is defined and, if so, use `Array.prototype.entries()` to get an iterator for the given iterable.
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- Use `Array.from()` to convert the result to an array of key-value pair arrays.
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- If `Symbol.iterator` is not defined for `obj`, use `Object.entries()` instead.
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```js
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const toPairs = obj =>
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obj[Symbol.iterator] instanceof Function && obj.entries instanceof Function
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? Array.from(obj.entries())
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: Object.entries(obj);
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```
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```js
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toPairs({ a: 1, b: 2 }); // [['a', 1], ['b', 2]]
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toPairs([2, 4, 8]); // [[0, 2], [1, 4], [2, 8]]
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toPairs('shy'); // [['0', 's'], ['1', 'h'], ['2', 'y']]
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toPairs(new Set(['a', 'b', 'c', 'a'])); // [['a', 'a'], ['b', 'b'], ['c', 'c']]
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```
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