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IT Nursery > News > javascript

javascript

What is the difference between call and apply?

What is the difference between using Function.prototype.apply() and Function.prototype.call() to invoke a function? var func = function() { alert('hello!'); }; func.apply(); vs func.call(); ...
  • April 10, 2022
  • 0 Comments

How do I loop through or enumerate a JavaScript object?

I have a JavaScript object like the following: var p = { "p1": "value1", "p2": "value2", "p3": "value3" }; Now I want to ...
  • April 10, 2022
  • 0 Comments

How do I correctly clone a JavaScript object?

I have an object x. I’d like to copy it as object y, such that changes to y do not modify x. I ...
  • April 9, 2022
  • 0 Comments

How can I check for an empty/undefined/null string in JavaScript?

I saw this question, but I didn’t see a JavaScript specific example. Is there a simple string.Empty available in JavaScript, or is it ...
  • April 9, 2022
  • 0 Comments

How to round to at most 2 decimal places, if necessary?

I’d like to round at most 2 decimal places, but only if necessary. Input: 10 1.7777777 9.1 Output: 10 1.78 9.1 How can ...
  • April 9, 2022
  • 0 Comments

Sort array of objects by string property value

I have an array of JavaScript objects: var objs =...
  • April 9, 2022
  • 0 Comments
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I want to enqueue a .js file to my child theme

I tried to enqueue a custom .js file in my child theme directory. In the functions.php of my child theme I find the ...
  • April 9, 2022
  • 0 Comments

Checking if a key exists in a JavaScript object?

How do I check if a particular key exists in a JavaScript object or array? If a key doesn’t exist, and I try ...
  • April 9, 2022
  • 0 Comments

Loop through an array in JavaScript

In Java you can use a for loop to traverse objects in an array as follows: String...
  • April 9, 2022
  • 0 Comments

How to insert an item into an array at a specific index (JavaScript)

I am looking for a JavaScript array insert method, in the style of: arr.insert(index, item) Preferably in jQuery, but any JavaScript implementation will ...
  • April 9, 2022
  • 0 Comments

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