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Explain Generator functions in JavaScript?
Generators
JavaScript supports Generator functions and Generator Objects. A generator function is the same as a normal function, but whenever it needs to generate a value it uses the 'yield' keyword rather than 'return'. The 'yield' keyword halts the function execution and sends a value back to the caller. It has an ability that it can resume the functionality from where it is left off.
syntax
function* generator(){ yeild 1; yeild 2; } Example
In the following example, using a generator function, natural numbers 10,9 and 8 were printed. Instead of printing each number individually we can run a for loop and print whatever numbers we need.
<html> <body> <script> function * number() { var num = 10; while (true) { yield num--; } } var gen = number(); document.write(gen.next().value); document.write("</br>"); document.write(gen.next().value); document.write("</br>"); document.write(gen.next().value); </script> </body> </html> Output
10 9 8
Updated on: 2019-07-30T22:30:26+05:30
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