Javascript add item to current array

javascript arrays array-push
Vinay picture Vinay · Mar 8, 2011 · Viewed 28.5k times · Source

I am trying to add an item to a current array.

var arrayValues = new Array();
arrayValues.push("Value 1");
arrayValues.push("Value 2");
arrayValues = document.getElementsByTagName('a');
arrayValues.push("Value 3");

By doing this way I get a error, and I dont get value 1 and value 2, after getting the hyperlink collection when I try to add a new item it throws Error: Object doesn't support this property or method which is the push method.

What is happening to the array after the collection of hyperlinks is assigned ? How can I add a new item to it ?

Answer

Matt Ball picture Matt Ball · Mar 8, 2011

Did you mean arrayValues.push(document.getElementsByTagName('a'));?

Otherwise, you're assigning the NodeList returned by getElementsByTagName(), which overwrites the array you had just pushed values into.

Side note: there's no reason to use new Array() here. Just write var arrayValues = [];.

Related questions

If else shorthand inside array .push()

Why I can do if else shorthand inside .push() function ? like var arr = []; arr.push(test||null); // nothing But var arr = []; var test = test||null; arr.push(test); // [null] I need to insert null if variable is undefined. Why I …

Read More
How can I remove a specific item from an array?

I have an array of numbers and I'm using the .push() method to add elements to it. Is there a simple way to remove a specific element from an array? I'm looking for the equivalent of something like: array.remove(…

Read More
For-each over an array in JavaScript

How can I loop through all the entries in an array using JavaScript? I thought it was something like this: forEach(instance in theArray) Where theArray is my array, but this seems to be incorrect.

Read More