27 lines
781 B
Markdown
27 lines
781 B
Markdown
---
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title: Unwind object
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type: snippet
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language: javascript
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tags: [object]
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author: chalarangelo
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cover: orange-coffee
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dateModified: 2022-04-18T05:00:00-04:00
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---
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Produces an array of objects from an object and one of its array-valued properties.
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- Use object destructuring to exclude the key-value pair for the specified `key` from the object.
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- Use `Array.prototype.map()` for the values of the given `key` to create an array of objects.
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- Each object contains the original object's values, except for `key` which is mapped to its individual values.
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```js
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const unwind = (key, obj) => {
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const { [key]: _, ...rest } = obj;
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return obj[key].map(val => ({ ...rest, [key]: val }));
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};
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```
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```js
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unwind('b', { a: true, b: [1, 2] }); // [{ a: true, b: 1 }, { a: true, b: 2 }]
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```
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