Common methods of JS array operation

Push (): Adds an element after the array and returns the length of the array;

Unshift (): In front of the array is like an element, and returns the length of the array;

Pop (): Deletes the last element;

var arr =[1,2,3,4,5];

Arr.push (6,7,8);

Console.log (arr);//push: The result of adding an element after the array is: [1,2,3,4,5,6,7,8]

Arr AA = [7,8,9,0];

Aa.unshift (4,5,6);

Console.log (AA);//unshift: The result of adding an element before the array is: [4,5,6,7,8,9,0]

var arr = [1,2,3,4,5];

Console.log (Arr.push (6)); The direct console, which returns the length of the array, is 6

var AA = [9,0];

Console.log (Aa.unshift (5)); The direct console, which returns the length of the array, is 3

Pop () Delete last element

var arrdele =[1,2,3];
Console.log (Arrdele.pop ());//returns the last element and deletes
Console.log (Arrdele);
Arrdele.pop ();//Delete last element
Console.log (Arrdele);//Returns an array

Shift () deletes the first element

var Delearr =[1,2,3,4];
Console.log (Delearr.shift ());//returns the first element and deletes
Console.log (Delearr);
Delearr.shift ();//Delete First element
Console.log (Delearr);

Common methods of JS array operation