The _.takeSkipping() method takes an array and a skip value (say n) and creates an array containing every nth element of the original array.
For an index >= 0 first element of the new array is always the same as the first element of the original array.
Syntax:
_.takeSkipping(array, skip_value)
Parameters:
- array: The array from which skip array is to be made.
- skip_value: The value which is used to make skip array from original array.
Return Value: This method returns a newly created skip array.
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 skip array using this method.
Javascript
// Defining underscore contrib variable var _ = require('underscore-contrib'); // Array var array = [1, 2, 3, 4, 6, 4, 3, 10]; // skipValue var skip = 2; // Generating Array using takeSkipping() method var arr =_.takeSkipping(array, skip); console.log("Array : ", array); console.log("Skip Value : ", skip); console.log("Generated Array : ", arr); |
Output: generated skip array contains the (n+2)th indexed element.
Array : [ 1, 2, 3, 4, 6, 4, 3, 10 ] Skip Value : 2 Generated Array : [ 1, 3, 6, 3 ]
Example 2: This method is safe for skip values greater or lesser than the array size.
Javascript
// Defining underscore contrib variable var _ = require('underscore-contrib'); // Array var array = [1, 2, 3, 4, 6, 4, 3, 10]; // skipValue var skip = 20; // Generating Array using takeSkipping() method var arr =_.takeSkipping(array, skip); console.log("Array : ", array); console.log("Skip Value : ", skip); console.log("Generated Array : ", arr); |
Output: Only first element or 0th indexed element is in the generated array.
Array : [ 1, 2, 3, 4, 6, 4, 3, 10 ] Skip Value : 2 0 Generated Array : [ 1 ]
Example 3: For negative skip value it returns an empty array.
Javascript
// Defining underscore contrib variable var _ = require('underscore-contrib'); // Array var array = [1, 2, 3, 4, 6, 4, 3, 10]; // skipValue var skip = -20; // Generating Array using takeSkipping() method var arr =_.takeSkipping(array, skip); console.log("Array : ", array); console.log("Skip Value : ", skip); console.log("Generated Array : ", arr); |
Output:
Array : [ 1, 2, 3, 4, 6, 4, 3, 10 ] Skip Value : -20 0 Generated Array : []
