@gmjs/array-create v0.0.1

Array Create

This library contains some array creation functions.

Installation

npm install --save @gmjs/array-create

API

arrayOfConstant

Creates an array filled with a given constant value. The length is provided as the first argument, the second parameter (value) is the constant that will fill the array.

const array = arrayOfConstant(3, 'some-value');
console.log(array);
// ['some-value', 'some-value', 'some-value']

arrayOfMapped

Creates an array of mapped values. The length is provided as the first argument. Second parameters, the mapper, is a function that takes the index of the array as an argument and returns the value for that index, and it generates a 'mapped' value for each index.

const array = arrayOfMapped(3, (index) => index * 2);
console.log(array);
// [0, 2, 4]

`arrayOfOnes

arrayOfUndefined

Creates an array of undefined values. The length is provided as the first argument.

const array = arrayOfUndefined(3);
console.log(array);
// [undefined, undefined, undefined]

range

Generates an array with a range of values.

The first parameter defined the from (starting) value, the second parameter defines the to (limit) value. The to value is not included in the range, meaning that the possible values in array can only be within [from, to).

It has an optional step parameter that specifies the step size. If not specified, the step size is 1. Step size can be negative, in which case the possible values in array are within (to, from], again starting with the from value.

const output = range(0, 5);
console.log(output);
// [0, 1, 2, 3, 4]

const output = range(1, 6, 2);
console.log(output);
// [1, 3, 5]

const output = range(5, 0, -1);
console.log(output);
// [5, 4, 3, 2, 1]