Best of Modern JavaScript — Generator Best Practices

New regex features and generator code style.

Since 2015, JavaScript has improved immensely.

It’s much more pleasant to use it now than ever.

In this article, we’ll look at JavaScript generators and new regex features.

The Asterisk

The asterisk for generator functions has an asterisk.

If must be between the function keyword and the function name.

And it can have any kind of spacing.

But usually, it has this format:

function* gen() {
  //..
}

Generator Function Declarations and Expressions

Generator function declarations and expressions are both valid.

We can write generator function declarations by writing:

function* gen() {
  //..
}

And we can create generator expressions by assigning a function declaration to a variable:

const gen = function* () {
  //..
}

Generator Method Definitions

We can add generator method definitions by writing:

const obj = {
  * gen(x, y) {
    //...
  }
};

We have the asterisk before the method name.

This is a shorthand for the following:

const obj = {
  gen: function*(x, y) {
    //...
  }
};

Generator method definitions are similar to getters and setters.

For example, we can write:

const obj = {
  get foo() {
    //...
  },
  set foo(value) {
    //...
  }
};

Like the asterisk, get and set are modifiers for the foo methods.

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