The Lodash _.firstExisting() method returns the first existing argument from the arguments list.
Note: If the first argument is not exist like null or undefined, this method ignores that argument and checks for next.
Syntax:
_.firstExisting(arg1, arg2,....,argn);
Parameters: This method takes n arguments to check for the first existing argument.
Return Value: This method returns the first existing arguments.
Note: This will not work in normal JavaScript because it requires the lodash.js contrib library to be installed. Lodash.js contrib library can be installed using npm install lodash-contrib.
Example 1:
Javascript
// Defining underscore lodash variable var _ = require('lodash-contrib');   var f_exist = _.firstExisting("gfg", "abc", 0, 1);     console.log("First Existing value is : ", f_exist); |
Output:
First Existing value is : gfg
Example 2:
Javascript
// Defining underscore lodash variable var _ = require('lodash-contrib');   var f_exist = _.firstExisting(null,         undefined, "gfg", "abc", 0, 1);     console.log("First Existing value is : ", f_exist); |
Output:
First Existing value is : gfg
Example 3:
Javascript
// Defining underscore lodash variable var _ = require('lodash-contrib');   var f_exist = _.firstExisting( 1, 2, 2, 3, 3, 4 );     console.log("First Existing value is : ", f_exist); |
Output:
First Existing value is : 1
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