orb-array

orb-array exposes concise APIs to manipulate arrays.

Installation

Browser Installation. The module is exported as orbarr global variable.

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/index.js"></script>

Node Installation

npm install orb-array

APIs

split

It splits an array into the specified number of pieces. When the number of pieces is larger than the input size, it creates empty pieces. It always returns the specified number of pieces. Some examples:

// Midway split is the default behavior.
const items = [1, 2, 3, 4, 5]
const pieces = split(items)
// Output: [[1, 2, 3], [4, 5]]

const items = [1, 2, 3, 4, 5]
const pieces = split(items, 10)
// Output: [[1], [2], [3], [4], [5], [], [], [], [], []]

range

It generates numbers in a given range, starting with 0.

const items = range(5)
// Output: [0, 1, 2, 3, 4]

fill

It generates a range of values using a function.

const items = fill(5, v => v*2) // v is an item index
// Output: [0, 2, 4, 6, 8]

zip

It zips arrays together. When the array sizes vary, the output size is equal to the shortest array.

const items = range(5)
const values = range(10)
const zipped = zip(items, values)
// Output: [[0, 0], [1, 1], [2, 2], [3, 3], [4, 4]]

reduce

reduce support several operations.

reduce.o reduces an array to an object. It supports customizations using the key and the value functions. Without customizations, key and value are the input array items.

const items = range(5)
const o = reduce.o(items)
// Output: {0:0, 1:1, 2:2, 3:3, 4:4}

const items = range(5)
const o = reduce.o(items, {value: v => v + 2})
// Output: {0:2, 1:3, 2:4, 3:5, 4:6}

reduce.mul multiplies elements of the input array together. When the input contains a non-numerical value, the output is NaN. The boolean values are converted to their numerical form (0 or 1).

const items = [1, 2, 5, 6]
const result = reduce.mul(items)
// Output: 60

// It returns 1 for an empty input.
const result = reduce.mul([])
// Output: 1

map

map supports several operations.

map.scale uses the input factor to scale elements.

const items = range(5)
const scaled = map.scale(items, 2)
// Output: [0, 2, 4, 6, 8]