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Lessons JavaScript Array Functions Bookmark and Share
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Due to the power of arrays, JavaScript comes ready-made with a number of useful functions for working with arrays. In this lesson we will discuss the most useful of these. In this tutorial we use the terms function and method, interchangeably.

Before exploring array functions please note that the array functions are invoked using the '.' operator as follows:


We use the concat() method to concatenate two or more arrays, or a series of values with an array. Code example follows:

fruits = ["Banana", "Grape"];
moreFruits = ["Mango", "Orange"];

The above code would output the elements of both the arrays.

The join() function converts all values in an array to strings and then joins them together into one larger string, placing an optional seperator between elements.

games = ["cricket", "football", "hockey"];

Without a parameter, join would use a comma to separate the array elements.

push() and pop()
We use the push() method to add an element to the end of an array. On the other hand the pop() method is used to remove an element from the end of an array. Following is an example of their use:

seasons = ["summer", "winter", "autumn"];

colors = ["white", "blue", "red"];

We use the reverse method to reverses the order of all the elements in an array.

vegitables = ["onion", "garlic", "potato", "tomato"];

We use the sort function to sort an array.

fruits = ["banana", "mango", "apple", "orange"];

Array .length property
The length property of any array returns the count of the elements that are in the array:

fruits = ["banana", "mango", "apple", "orange"];
document.write(fruits.length); // would output 4

Generally we use the length property of an array in loops to iterate over the whole array:

for (i = 0; i < fruits.length; i++) {
//array manipulation code goes here

Next >>> Lesson No. 18: JavaScript Objects and Classes

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