Page 104 - JavaScript

Results in a new Array:

["a", "b", "c", "d", "e", "f", "g", "h"]

Without Copying the First Array

var longArray = [1, 2, 3, 4, 5, 6, 7, 8],
shortArray = [9, 10];

3

Provide the elements of shortArray as parameters to push using Function.prototype.apply

longArray.push.apply(longArray, shortArray);

6

Use the spread operator to pass the elements of shortArray as separate arguments to push

longArray.push(...shortArray)

The value of longArray is now:

[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Note that if the second array is too long (>100,000 entries), you may get a stack overflow error
(because of how apply works). To be safe, you can iterate instead:

shortArray.forEach(function (elem) {
longArray.push(elem);
});

Array and non-array values

var array = ["a", "b"];

3

var arrConc = array.concat("c", "d");

6

var arrConc = [...array, "c", "d"]

Results in a new Array:

["a", "b", "c", "d"]

You can also mix arrays with non-arrays

https://riptutorial.com/ 61