javascript append to array

1var colors= ["red","blue"];
2	colors.push("yellow"); 

1array.push(element)

1const array1 = ['a', 'b', 'c'];
2const array2 = ['d', 'e', 'f'];
3const array3 = array1.concat(array2);

1var fruits = ["222", "vvvv", "eee", "eeee"];
2
3fruits.push("Kiwi"); 

1let array = ["A", "B"];
2let variable = "what you want to add";
3
4//Add the variable to the end of the array
5array.push(variable);
6
7//===========================
8console.log(array);
9//output =>
10//["A", "B", "what you want to add"]

1arr = [1, 2, 3, 4]
2arr.push(5) // adds element to end
3
4arr.unshift(0) // adds element to beginning