I've been told not to use for...in with arrays in JavaScript. Why not?...
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....
In Java you can use a for loop to traverse objects in an array as follows: String[] myStringArray = {"Hello", "World"}; for (String s : myStringArray) { // Do something } Can you do the same in JavaScript?...
var obj = { name: "Simon", age: "20", clothing: { style: "simple", hipster: false } } for(var propt in obj){ console.log(propt + ': ' + obj[propt]); } How does the variable...
This question already has answers here:...
I'm working with a bit of html and Javascript code that I've taken over from someone else. The page reloads a table of data (via an asynchronous request) every ten seconds, and then re-builds the table using some DOM code. The code in quest...
I learned from books that you should write for loop like this? for(var i=0, len=arr.length; i < len; i++){ // blah blah } so the arr.length will not be calculated each time. Others say that the compiler will do some optimization to thi...
This question already has answers here:...
I've heard this quite a few times. Are JavaScript loops really faster when counting backward? If so, why? I've seen a few test suite examples showing that reversed loops are quicker, but I can't find any explanation as to why! I'm...
This question already has answers here:...
©2020 All rights reserved.