JavaScript Built-in Functions

In the past few months, I've been learning the ropes of JavaScript and came across some useful built-in functions that always come in handy.

Arrow Functions

With arrow functions you don’t need to pass the function keyword; it can also be passed as an anonymous function.

functionOne = ( ) => {
     return console.log(‘this is an anonymous function);
}

functionTwo  =  parameter => {
    return console.log(this has one parameter);
}

An Inline function doesn’t need the return keyword and you can remove the parenthesis if you’re passing 1 parameter.

const multiply = num => num * 4;

verses

const multiply = (num) => {
return num * 4;
}

Splice

The Splice function selects element(s) in array that can be replaced or removed.

Let fruits = [‘apple’, ‘kiwi’, ‘orange’, ‘avocado’];`

Fruits.splice(2, 0, ‘raspberries’);

2 is where the new element will be positioned, 0 is the number of elements that are removed, ‘raspberry is the new element that's added to the array.

modified array: = [‘apple’, ‘kiwi’, ‘orange’, ‘raspberry’, ‘avocado’];

Slice

Slice Returns a new array.

names = [‘Pat’, ‘John’, ‘Ann’, ‘Lukas’, ‘Tom’]
names.slice(2, 3);
new array name: [‘Ann’]

Photo credit: Christina Morillo from Pexels