Underscore.js _.weave() Method

The _.weave() method takes two arrays and returns an array with both arrays woven together.

Note: The array returned from _.weave() method will be woven till the shortest array, rest array values are the same.

Syntax:

_.weave(array1, array2)

Parameters:

• array1: The first array.
• array2: The second array.

Return Value: This method returns a woven array made from array1 and array2.

Note: This will not work in normal JavaScript because it requires the underscore.js contrib library to be installed.  Underscore.js contrib library can be installed using npm install underscore-contrib –save.

Example 1: In this example, we will generate a woven array with array1’s and array2’s sizes as same.

Javascript

// Defining underscore contrib variable
var _ = require('underscore-contrib');

// Array1
var array1 = [1, 2, 3, 4];

// Array2
var array2 = [5, 6, 7, 8]

// Generating Array using weave() method
var arr =_.weave(array1, array2);
console.log("Array1 : ", array1);
console.log("Array2 : ", array2);
console.log("Woven Array : ", arr);

Output:

Array1 :  [ 1, 2, 3, 4 ]
Array2 :  [ 5, 6, 7, 8 ]
woven Array :  [
  1, 5, 2, 6,
  3, 7, 4, 8
]

Example 2: When size of array1 < size of array2

Javascript

// Defining underscore contrib variable
var _ = require('underscore-contrib');

// Array1
var array1 = [1, 2];

// Array2
var array2 = [5, 6, 7, 8]

// Generating Array using weave() method
var arr =_.weave(array1, array2);
console.log("Array1 : ", array1);
console.log("Array2 : ", array2);
console.log("Woven Array : ", arr);

Output:

Array1 :  [ 1, 2 ]
Array2 :  [ 5, 6, 7, 8 ]
Woven Array :  [ 1, 5, 2, 6, 7, 8 ]

Example 3: When the size of array1 > size of array2 

Javascript

// Defining underscore contrib variable
var _ = require('underscore-contrib');

// Array1
var array1 = [1, 2, 3, 4];

// Array2
var array2 = [5, 6]

// Generating Array using weave() method
var arr =_.weave(array1, array2);
console.log("Array1 : ", array1);
console.log("Array2 : ", array2);
console.log("Woven Array : ", arr);

Output:

Array1 :  [ 1, 2, 3, 4 ]
Array2 :  [ 5, 6 ]
Woven Array :  [ 1, 5, 2, 6, 3, 4 ]