Node.js util.types.isMap() Method
The util.types.isMap() method is an inbuilt application programming interface of util module which is primarily designed to support the needs of Node.js own internal APIs.
The util.types.isMap() method is used to determine whether the value is a built-in Map instance or not.
Syntax:
util.types.isMap( value )
Parameters: This method accepts a single parameter value which holds any valid JavaScript data types like Boolean, Null, Number, Object, etc.
Return value: It returns a Boolean value i.e. returns true if value is an instance of built-in Map otherwise it returns false.
Below examples illustrate the use of util.types.isMap() method in Node.js:
Example 1:
const util = require( 'util' );
console.log(util.types.isMap(1));
console.log(util.types.isMap( "Map" ));
console.log(util.types.isMap( new Map()));
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Output:
false
false
true
Example 2:
const util = require( 'util' );
const map = new Map();
map.set( "geeks" , "Computer science" );
map.set( "Hello" , "World" );
const text = "GeeksforGeeks" ;
console.log(util.types.isMap(map));
console.log(util.types.isMap(text));
console.log(util.types.isMap());
|
Output:
true
false
false
Note: The above program will compile and run by using the node index.js
command.
Reference: https://nodejs.org/dist/latest-v13.x/docs/api/util.html#util_util_types_ismap_value
Last Updated :
13 Oct, 2021
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