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JavaScript | Generator.prototype.return() Method

  • Last Updated : 24 Nov, 2021

The Generator.prototype.return() method is an inbuilt method in JavaScript which is used to return the given value and finishes the generator.
Syntax: 
 

gen.return( value );

Parameters: This method accepts single parameter as mentioned above and described below: 
 

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  • value: This parameter holds the value which to be returned.

Return value: This method returns the value which is given to it as an argument.
Below examples illustrate the Generator.prototype.return() method in JavaScript:
Example 1: 
 

javascript






function* GFG() {
  yield "GeeksforGeeks";
  yield "JavaScript";
  yield "Generator.prototype.next()";
}
 
const geek = GFG();
console.log(geek.next());
console.log(geek.next()); 
console.log(geek.return("Shubham  Singh"));     
console.log(geek.next());         

Output: 
 

Object { value: "GeeksforGeeks", done: false }
Object { value: "JavaScript", done: false }
Object { value: "Shubham  Singh", done: true }
Object { value: undefined, done: true }

Example 2: 
 

javascript




function* GFG(pageSize = 1, list) {
    let output = [];
    let index = 0;
 
    while (index < list.length) {
        output = [];
        for (let i = index; i < index + pageSize; i++) {
            if (list[i]) {
                output.push(list[i]);
            }
        }
 
        yield output;
        index += pageSize;
    }
}
list = [1, 2, 3, 4, 5, 6, 7, 8]
var geek = GFG(3, list);             
 
console.log(geek.next());     
console.log(geek.next());     
console.log(geek.next());
console.log(geek.next());
console.log(geek.return(list));

Output: 
 

Object { value: Array [1, 2, 3], done: false }
Object { value: Array [4, 5, 6], done: false }
Object { value: Array [7, 8], done: false }
Object { value: undefined, done: true }
Object { value: Array [1, 2, 3, 4, 5, 6, 7, 8], done: true }

Supported Browsers: The browsers supported by Generator.prototype.return() method are listed below: 
 

  • Google Chrome 50 and above
  • Edge 13 and above
  • Firefox 38 and above
  • Opera 37 and above
  • safari 10 and above
     



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