Node.js util.types.isMapIterator() Method
The util.types.isMapIterator() method is an inbuilt application programming interface of util module which is primarily designed to support the needs of Node.js internal APIs.
The util.types.isMapIterator() method is used to determine whether the value is an iterator returned for a built-in Map instance or not.
Syntax:
util.types.isMapIterator( value )
Parameters: This method accepts a single parameters 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 iterator returned for a built-in Map otherwise it returns false.
Below examples illustrate the use of util.types.isMapIterator() Method in Node.js:
Example 1:
const util = require( 'util' );
console.log(util.types.isMapIterator( true ));
console.log(util.types.isMapIterator( new Map().values()));
console.log(util.types.isMapIterator( new Map().keys()));
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Output:
false
true
true
Example 2:
const util = require( 'util' );
const map = new Map();
console.log(util.types.isMapIterator(map.keys()));
console.log(util.types.isMapIterator(map.entries()));
console.log(util.types.isMapIterator(map[Symbol.iterator]()));
|
Output:
true
true
true
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_ismapiterator_value
Last Updated :
13 Oct, 2021
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