Functions

Created Montag 25 November 2019

Regular binding -> Function value

This works like a variable square. One can handle it like a normal variable binding. To call this function the binding has to be defined before the call, like a variable.

const square = function(x) {
  return x * x;
};

Declaration

Works like a function definition in other programming languages. -> Needs no semicolon at the end. The function can be declared anywhere in the code.

function square(x) {
  return x * x;
}

Arrow functions

Work like regular bindings but make it possible to write smaller functions. Some sort of lambda functions in other languages, but not identical.

const power = (base, exponent) => {
  let result = 1;
  for (let count = 0; count < exponent; count++) {
    result *= base;
  }
  return result;
};

With one parameter:

const square1 = (x) => { return x * x; };
const square2 = x => x * x;

Without parameters:

const horn = () => {
  console.log("Toot");
};