29 lines
1.0 KiB
Markdown
29 lines
1.0 KiB
Markdown
---
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title: orderBy
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tags: object,array,intermediate
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---
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Returns a sorted array of objects ordered by properties and orders.
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- Uses `Array.prototype.sort()`, `Array.prototype.reduce()` on the `props` array with a default value of `0`, use array destructuring to swap the properties position depending on the order passed.
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- If no `orders` array is passed it sort by `'asc'` by default.
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```js
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const orderBy = (arr, props, orders) =>
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[...arr].sort((a, b) =>
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props.reduce((acc, prop, i) => {
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if (acc === 0) {
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const [p1, p2] = orders && orders[i] === 'desc' ? [b[prop], a[prop]] : [a[prop], b[prop]];
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acc = p1 > p2 ? 1 : p1 < p2 ? -1 : 0;
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}
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return acc;
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}, 0)
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);
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```
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```js
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const users = [{ name: 'fred', age: 48 }, { name: 'barney', age: 36 }, { name: 'fred', age: 40 }];
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orderBy(users, ['name', 'age'], ['asc', 'desc']); // [{name: 'barney', age: 36}, {name: 'fred', age: 48}, {name: 'fred', age: 40}]
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orderBy(users, ['name', 'age']); // [{name: 'barney', age: 36}, {name: 'fred', age: 40}, {name: 'fred', age: 48}]
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```
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