What are First-class Functions?

In JavaScript and other functional languages, functions can also be assigned to variables and you can pass them around, just like they were variables.

First-class function are functions that you can:

• Pass as arguments to other functions
• Store them in a variable
• Return as values from other functions

Take the following as an example:

const greet = function () {
    console.log('👋');
}

// The greet variable is now a function, we can invoke it
greet();

Here the greet function is passed around and is treated like a variable.

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Resources:

• First-class Functions