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var arr1 = ["Hello"," "];
var arr2 = ["World","!"];
var both = arr1.concat(arr2);
//both = ["Hello"," ","World","!"];
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var colors= ["red","blue"];
colors.push("yellow"); //["red","blue","yellow"]
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const array1 = ['a', 'b', 'c'];
const array2 = ['d', 'e', 'f'];
const array3 = array1.concat(array2);
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// initialize array
var arr = [
"Hi",
"Hello",
"Bonjour"
];
// append new value to the array
arr.push("Hola");
console.log(arr);
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arr = [1, 2, 3, 4]
arr.push(5) // adds element to end
arr.unshift(0) // adds element to beginning