The _.unsplatl() method takes a function expecting an array as its first argument and returns a function which works identically, but takes list of leading arguments. It is similar to the unsplat() method. It mimics the rest parameter syntax in ECMAScript 6.
Syntax:
_.unsplatl( function )
Parameters:
- function: It is the original function that takes its first argument as an array.
Return Value: This method returns a function.
Note: This will not work in normal JavaScript because it requires the underscore.js contrib library to be installed. The Underscore.js contrib library can be installed using npm install underscore-contrib –save.
Example 1:
Javascript
// Defining underscore contrib variable var _ = require("underscore-contrib"); // Function that takes array as the // first parameter function g(arr, val) { return val + " : " + arr; } // Using the unsplatl() method var gfgFunc = _.unsplatl(g); console.log(gfgFunc(1, 2, 3, 4, "A")); |
Output:
A : 1,2,3,4
Example 2:
Javascript
// Defining underscore contrib variable var _ = require("underscore-contrib"); // Function that takes array as the // first parameter function g(arr) { return arr; } // Using the unsplatl() method var gfgFunc = _.unsplatl(g); console.log(gfgFunc(1, 2, 3, 4)); |
Output:
[ 1, 2, 3, 4 ]
Example 3:
Javascript
// Defining underscore contrib variable var _ = require("underscore-contrib"); // Function that takes array as the // first parameter function g(arr, val) { return arr.join(val); } // Using the unsplatl() method var gfgFunc = _.unsplatl(g); console.log( gfgFunc("neveropen", "Computer Science Portal for Geeks", " : ") ); |
Output:
neveropen : Computer Science Portal for Geeks
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