Lodash _.tap() Method
Lodash is a JavaScript library that works on the top of underscore.js. Lodash helps in working with arrays, strings, objects, numbers, etc.
The _.tap() method of Sequence in lodash is used to call interceptor. Moreover, the main task of the method is to “tap into” a method chain sequence so that the intermediate results can be modified.
Syntax:
_.tap(value, interceptor)
Parameters: This method accepts two parameters as mentioned above and described below:
- value: It is the value to be given to the interceptor.
- interceptor: It is the function to be called.
Return Value: This method returns the value.
Example 1:
Javascript
// Requiring lodash library const _ = require('lodash'); // Calling tap() method let result = _([5, 6, 7]).tap(function(arr) { // Modifying input array using push // operation arr.push(8); }) .value(); // Displays output console.log(result); |
Output:
[ 5, 6, 7, 8 ]
Example 2:
Javascript
// Requiring lodash library const _ = require('lodash'); // Calling tap() method let result = _(['Geeks', 'for']).tap(function(arr) { // Modifying input array using push // operation arr.push('Geeks'); }) .value(); // Displays output console.log(result); |
Output:
[ 'Geeks', 'for', 'Geeks' ]
Example 3: Using pop operation and tail method.
Javascript
// Requiring lodash library const _ = require('lodash'); // Calling tap() method let result = _(['f', 'g', 'h']).tap(function(arr) { // Modifying input array using pop // operation arr.pop(); }) .tail() // Using tail() method .value(); // Displays output console.log(result); |
Output:
[ 'g' ]
Reference: https://lodash.com/docs/4.17.15#tap
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