What are Generator functions and how to use generator functions

General JavaScript functions can’t be interrupted in the middle of a function execution, once the function is invoked until function execution completes. (i.e… Either by returning some value from the function or throwing error inside the function).
When we want to execute functions which can be interrupted or which can execute after a while once execution is started then ECMAScript-6 came up with a new type of functions called Generator Functions.

A generator function is a function which can be interrupted or which can execute after a while once the execution is started is called Generator Functions.

Generator functions are declared the same as normal functions of JavaScript but “function” keyword is suffixed with asterisk(*) symbol or asterisk prefixed with the function name.

There are two ways of declaring generator functions

2. Function name prefixed with asterisk(*)

Before going to understand more on generator functions let us try to understand about “yield” keyword of ECMAScript-6

“Done” property returns true in 2 cases

Other than this three cases the “done” property returns false.

Output

From the above “gen” is an iterator object.

2. When the function is having a return statement

Output

Conclusion

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