Start of main content## Recommended snippets

Applies a function against an accumulator and each element in the array (from left to right), returning an array of successively reduced values.

- Use
`Array.prototype.reduce()`

to apply the given function to the given array, storing each new result.

```
const reduceSuccessive = (arr, fn, acc) =>
arr.reduce(
(res, val, i, arr) => (res.push(fn(res.slice(-1)[0], val, i, arr)), res),
[acc]
);
```

```
reduceSuccessive([1, 2, 3, 4, 5, 6], (acc, val) => acc + val, 0);
// [0, 1, 3, 6, 10, 15, 21]
```

### Mapped array symmetric difference

JavaScript, Array

Returns the symmetric difference between two arrays, after applying the provided function to each array element of both.

### Partition array

JavaScript, Array

Applies

`fn`

to each value in`arr`

, splitting it each time the provided function returns a new value.### Mapped array difference

JavaScript, Array

Returns the difference between two arrays, after applying the provided function to each array element of both.