8ee50178f3
Correct: `Array.from()` (it’s a static method) Incorrect: `Array.join()` (doesn’t exist; it’s a prototype method) This patch uses the common `#` syntax to denote `.prototype.`.
26 lines
1017 B
Markdown
26 lines
1017 B
Markdown
### orderBy
|
|
|
|
Returns a sorted array of objects ordered by properties and orders.
|
|
|
|
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.
|
|
If no `orders` array is passed it sort by `'asc'` by default.
|
|
|
|
```js
|
|
const orderBy = (arr, props, orders) =>
|
|
[...arr].sort((a, b) =>
|
|
props.reduce((acc, prop, i) => {
|
|
if (acc === 0) {
|
|
const [p1, p2] = orders && orders[i] === 'desc' ? [b[prop], a[prop]] : [a[prop], b[prop]];
|
|
acc = p1 > p2 ? 1 : p1 < p2 ? -1 : 0;
|
|
}
|
|
return acc;
|
|
}, 0)
|
|
);
|
|
```
|
|
|
|
```js
|
|
const users = [{ name: 'fred', age: 48 }, { name: 'barney', age: 36 }, { name: 'fred', age: 40 }];
|
|
orderBy(users, ['name', 'age'], ['asc', 'desc']); // [{name: 'barney', age: 36}, {name: 'fred', age: 48}, {name: 'fred', age: 40}]
|
|
orderBy(users, ['name', 'age']); // [{name: 'barney', age: 36}, {name: 'fred', age: 40}, {name: 'fred', age: 48}]
|
|
```
|