I've been told not to use for...in with arrays in JavaScript. Why not?...
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?...
This question already has an answer here: JavaScript closure inside loops – simple practical example 43 answers I am running an event loop of th...
I have the following code: for(var i = 0; i < list.length; i++){ mc_cli.get(list[i], function(err, response) { do_something(i); }); } mc_cli is a connection to a memcached database. As you can imagine, the callback function is...
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...
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Just a quick question about the scoping of JavaScript variables. Why does the alert() function print the value of i instead of returning undefined? $(document).ready(function () { for(var i = 0; i < 10; i += 1){ } alert("What...
I have code like the following: function test(obj) { if(//some conditon) { obj.onload(); }else{ obj.onerror(); } } for(var i=0;i<4;i++){ test({ onload:function(e){ //some code t...
I want to generate each number between 0 to 4 randomly using javascript and each number can appear only once. So I wrote the code: for(var l=0; l<5; l++) { var randomNumber = Math.floor(Math.random()*5); alert(randomNumber) } but this...
I was reading airbnb javascript guide. There is a particular statement, that says: Don’t use iterators. Prefer JavaScript’s higher-order functions instead of loops like for-in or for-of. The reason they give for the above statement is:...
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