What is Generators

Generators are a function that is used for lazy execution. it is used to execute suspended and resumed at a later point.

Generators have two methods

Yield method – This method is called in a function to halt the execution of the function at the specific line where the yield method is called.

Next method – This method is called from the main application to resume the execution of a function that has a yield method. The execution of the function will continue until the next yield method or till the end of the method.

function* addNumber(x) {
   yield x + 1;   //value of x is 6 but halted program
   var y = 2;
   return x + y;
}
var gen = addNumber(5);
console.log(gen.next().value);  //6
console.log(gen.next().value);  //7