// Array length shows how many elements exist in the array
let fruits = ['apple', 'banana', 'cherry', 'date', 'elderberry']
let result = fruits.length;
console.log(result);
Array.toString()
// The JavaScript method toString() converts an array to a string of (comma separated) array values.
let fruits = ['apple', 'banana', 'cherry', 'date', 'elderberry']
let result = fruits.toString();
console.log(result);
Array.at(index)
// at() returns the element at the specified index
let fruits = ['apple', 'banana', 'cherry', 'date', 'elderberry']
let result = fruits.at(2);
console.log(result);
Array.join('whatever')
// join() joins the elements of an array into a string and joins with whatever we insert inside (join()) parentheses
let fruits = ['apple', 'banana', 'cherry', 'date', 'elderberry'];
let result = fruits.join('-')
console.log(result); // => apple-banana-cherry-date-elderberry
Array.pop()
// pop() removes the last element from an array and returns that element
let fruits = ['apple', 'banana', 'cherry', 'date', 'elderberry'];
let result = fruits.pop()
console.log(result); // => elderberry
console.log(fruits); // => ['apple', 'banana', 'cherry', 'date'];
Array.push()
// Array.push() adds from the end and shows the length
let fruits = ['apple', 'banana', 'cherry', 'date', 'elderberry'];
let result = fruits.push('kiwi');
console.log(result); // => 6 ! returns the length
console.log(fruits); // => ['apple', 'banana', 'cherry', 'date', 'elderberry', 'kiwi']
Array.shift()
// shift() deletes from the beginning and returns the deleted element
let fruits = ['apple', 'banana', 'cherry', 'date', 'elderberry'];
let result = fruits.shift();
console.log(result); // => apple
Array.unshift()
// unshift() adds from the beginning and returns the new length
let fruits = ['apple', 'banana', 'cherry', 'date', 'elderberry'];
let result = fruits.unshift('pear');
console.log(result); // => apple
console.log(fruits); // => ['pear', 'apple', 'banana', 'cherry', 'date', 'elderberry']
delete array[index]
// delete leaves empty holes in the array therefore use push() or pop()
let fruits = ['apple', 'banana', 'cherry', 'date', 'elderberry'];
delete fruits[1];
console.log(fruits); // => ['apple', empty, 'banana', 'cherry', 'date', 'elderberry']
concat()
// The concat() method creates a new array by merging (concatenating) existing arrays:
const myGirls = ["Cecilie", "Lone"];
const myBoys = ["Emil", "Tobias", "Linus"];
const myChildren = myGirls.concat(myBoys);
array.flat()
// The flat() method creates a new array with sub-array elements concatenated to a specified depth.
const myArr = [[1,2],[3,4],[5,6]];
const newArr = myArr.flat();
console.log(newArr); // => [1,2,3,4,5,6]
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