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 variableconst _ = require('underscore-contrib');// Checkingconsole.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 variableconst _ = require('underscore-contrib');// Checkingconsole.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 variableconst _ = require('underscore-contrib'); // Checkingconsole.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 variableconst _ = require('underscore-contrib'); // Checkingconsole.log("The Value is Associative : " +_.isAssociative("neveropen")); |
Output:
The Value is Associative : false
