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Lodash _.cond() Method

  • Last Updated : 23 Sep, 2020

Lodash is a JavaScript library that works on the top of underscore.js. Lodash helps in working with arrays, strings, objects, numbers, etc.
The _.cond method creates a function that iterates over pairs and invokes the corresponding function of the first predicate to return truthy. The predicate-function pairs are invoked with the binding and arguments of the created function.

Syntax:

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_.cond(pairs)

Parameters: This method accepts one parameter as mentioned above and described below:

  • pairs: [Array]The predicate-function pairs.

Return Value:  [Array]The predicate-function pairs.



Note : Here, const _ = require(‘lodash’) is used to import the lodash library in the file.

Example 1:

Javascript




// Requiring the lodash library  
const _ = require("lodash");
  
//  using _.cond() method
var func1 = _.cond([
    [_.matches({ 'geeks': 1 }),
        _.constant('Matches Geeks')],
    [_.conforms({ 'for': _.isNumber }),
        _.constant('Matches For')],
    [_.stubTrue, _.constant('no match')]
]);
  
// Storing the Result
gfg = func1({ 'geeks': 1, 'b': 2 });
  
// Printing the output  
console.log(gfg);

Output:

"Matches Geeks"

Example 2:

Javascript




// Requiring the lodash library  
const _ = require("lodash");
  
//  using _.cond() method
var func2 = _.cond([
    [_.matches({ 'geeks': 1 }), 
        _.constant('Matches Geeks')],
    [_.conforms({ 'for': _.isNumber }), 
        _.constant('Matches For')],
    [_.stubTrue, _.constant('No Match')]
]);
  
// Storing Result 
gfg1 = func2({ 'geeks': 0, 'for': 1 });
gfg2 = func2({ 'geeks': '1', 'for': '2' });
  
// Printing the output  
console.log(gfg1);
console.log(gfg2)

Output:

"Matches For"
"No Match"



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