Lodash _.isMap() Method

Lodash _.isMap() method checks whether the given value is a map object or not and returns the corresponding boolean value.

Syntax:

_.isMap( value );

Parameters:

• value: This parameter holds the value that needs to be checked for a map object.

Return Value:

This method returns a Boolean value(Returns true if the given value is a map object, else false).

Example 1: In this example, it is returning true as the given value is a map object.

// Defining Lodash variable 
const _ = require('lodash'); 

let testMap = new Map;

// Checking for Map 
console.log("The Value is Map : "
        + _.isMap(testMap));

Output:

The Value is Map : true

Example 2:  In this example, it is returning false as the given value is not a map object.

// Defining Lodash variable 
const _ = require('lodash');

let testMap = new WeakMap;

// Checking for Map 
console.log("The Value is Map : "
    + _.isMap(testMap));

Output:

The Value is Map : false

_.isMap() checks if a value is a Map object.

How do you use _.isMap()?

Use _.isMap(value), where value is the item to check if it is a Map.

Can _.isMap() identify weak maps?

No, _.isMap() specifically checks for Map objects, not WeakMaps.

Does _.isMap() work with empty maps?

Yes, _.isMap() returns true for empty Map objects.

Can _.isMap() differentiate between Map and Object?

Yes, _.isMap() only returns true for Map objects, not for plain objects.