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:
// Node.js program to demonstrate the // util.types.isMapIterator() method // Using require to access util module const util = require( 'util' ); // Using util.types.isMapIterator() method console.log(util.types.isMapIterator( true )); // Using util.types.isMapIterator() method console.log(util.types.isMapIterator( new Map().values())); // Using util.types.isMapIterator() method console.log(util.types.isMapIterator( new Map().keys())); |
Output:
false true true
Example 2:
// Node.js program to demonstrate the // util.types.isMapIterator() method // Using require to access util module const util = require( 'util' ); const map = new Map(); // Using util.types.isMapIterator() method console.log(util.types.isMapIterator(map.keys())); // Using util.types.isMapIterator() method console.log(util.types.isMapIterator(map.entries())); // Using util.types.isMapIterator() method 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
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