What is an array?

In a simple term, an array is a collection of items that consist of the same datatype. It usually have at least one item in the collection and it's starting index is always 0.

Let's create our first array

let food = ['Rice','Bread','Meat']

We have created an array and stored it in a variable.

We can retrieve an item from an array by specifying the index.

let first = food[0]
 console.log(first)
 // Rice

Methods of an array

push

The push() method add a new item to an array.

let updatedFood = food.push('Beans')
console.log(updatedFood)
// ['Rice','Bread','Meat','Beans']

pop

The pop() method remove an item from an array

let updatedFood = food.pop()
console.log(updatedFood)
// ['Rice','Bread']

includes

The includes()method checks if an item is in the array(usually return a boolean value)

let checkFood = food.includes('Bread')
console.log(checkFood)
// true

indexOf

The indexOf() method search for an item in the array and returns the position is found else it returns -1

let foodPosition = food.indexOf('Rice')
console.log(foodPosition)
// 0

map

The map() method returns a new array with a result of calling a function on every item of the array

let numbers = ['1','2','3']

function addToNumber(num){
    return num + 2;
}

let newArray = numbers.map(addToNumber)
console.log(newArray)
// ['2','4','6']

slice

The slice() method extracts items from an array based on passed in arguments or else it will copy the array. This method can take two arguments, the first argument is the starting position of the item you want to extract while the second argument is the ending position. It returns a new array with of result with the passed in argument and the arguments.

let extractedFood = food.slice(1,2)
console.log(extractedFood)
// ['Beans','Meat']

filter

The filter() method returns a new array containing all items of the calling array for which the provided filtering function returns true.

let result = food.filter(word => word.length > 4);
console.log(result);
// ["Bread", "Meat"]

toString

The toString() method converts an array to a sting

let foodString = food.toString()
console.log(foodString)
// Rice,Bread,Meat

sort

The sort() method returns a sorted array

let sortedFood = food.sort()
console.log(sortedFood)
// ['Bread','Meat','Rice']

Hope it helped.

Thanks