Underscore.js _.isAssociative() Method

The _.isAssociative() Method checks whether the given value is associative or not. An associative object is one in which its elements can be accessed via a key or index. Exp, Arrays.

Syntax:

_.isAssociative(value);

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

• value: Given value to be checked for associative.

Return Value: This method returns a Boolean value(Returns true if the given value is associative, else false).

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

Example 1: Method returning true for an array.

Javascript

// Defining underscore contrib variable
const _ = require('underscore-contrib');
// Checking
console.log("The Value is Associative : " + _.isAssociative([1, 2, 3, 4]));

Output:

The Value is Associative : true

Example 2: Method returning false for an integer.

Javascript

// Defining underscore contrib variable
const _ = require('underscore-contrib');
// Checking
console.log("The Value is Associative : " + _.isAssociative(2));

Output:

The Value is Associative : false

Example 3: For a mapping, this method returns true as its value can be accessed by keys.

Javascript

// Defining underscore contrib variable
const _ = require('underscore-contrib');
// Checking
console.log("The Value is Associative : " +_.isAssociative({1:2, 3:3}));

Output:

The Value is Associative : true

Example 4: Method returning false for a string variable.

Javascript

// Defining underscore contrib variable
const _ = require('underscore-contrib');
// Checking
console.log("The Value is Associative : " +_.isAssociative("GeeksforGeeks"));

Output:

The Value is Associative : false