How to access first level keys of a 2d array with a foreach loop? [duplicate]
You can access your array keys like so: foreach ($array as $key => $value)
foreach
Get loop counter/index using for…of syntax in JavaScript
for…in iterates over property names, not values, and does so in an unspecified order (yes, even after ES6). You shouldn’t use it to iterate over arrays. For them, there’s ES5’s forEach method that passes both the value and the index to the function you give it: var myArray = [123, 15, 187, 32]; myArray.forEach(function (value, … Read more
Loop over an array in JavaScript
TL;DR Your best bets are usually a for-of loop (ES2015+ only; spec | MDN) – simple and async-friendly for (const element of theArray) { // …use `element`… } forEach (ES5+ only; spec | MDN) (or its relatives some and such) – not async-friendly (but see details) theArray.forEach(element => { // …use `element`… }); a simple … Read more
Performance of FOR vs FOREACH in PHP
My personal opinion is to use what makes sense in the context. Personally I almost never use for for array traversal. I use it for other types of iteration, but foreach is just too easy… The time difference is going to be minimal in most cases. The big thing to watch for is: for ($i … Read more
Last iteration of enhanced for loop in java
Another alternative is to append the comma before you append i, just not on the first iteration. (Please don’t use “” + i, by the way – you don’t really want concatenation here, and StringBuilder has a perfectly good append(int) overload.) int[] array = {1, 2, 3…}; StringBuilder builder = new StringBuilder(); for (int i … Read more
How to remove element from array in forEach loop?
It looks like you are trying to do this? Iterate and mutate an array using Array.prototype.splice var pre = document.getElementById(‘out’); function log(result) { pre.appendChild(document.createTextNode(result + ‘\n’)); } var review = [‘a’, ‘b’, ‘c’, ‘b’, ‘a’]; review.forEach(function(item, index, object) { if (item === ‘a’) { object.splice(index, 1); } }); log(review); <pre id=”out”></pre> Which works fine for … Read more
How do you remove an array element in a foreach loop?
If you also get the key, you can delete that item like this: foreach ($display_related_tags as $key => $tag_name) { if($tag_name == $found_tag[‘name’]) { unset($display_related_tags[$key]); } }
Is a LINQ statement faster than a ‘foreach’ loop?
Why should LINQ be faster? It also uses loops internally. Most of the times, LINQ will be a bit slower because it introduces overhead. Do not use LINQ if you care much about performance. Use LINQ because you want shorter better readable and maintainable code.
Javascript efficiency: ‘for’ vs ‘forEach’ [closed]
for for loops are much more efficient. It is a looping construct specifically designed to iterate while a condition is true, at the same time offering a stepping mechanism (generally to increase the iterator). Example: for (var i=0, n=arr.length; i < n; ++i ) { … } This isn’t to suggest that for-loops will always … Read more
What does [].forEach.call() do in JavaScript?
[] is an array. This array isn’t used at all. It’s being put on the page, because using an array gives you access to array prototypes, like .forEach. This is just faster than typing Array.prototype.forEach.call(…); Next, forEach is a function which takes a function as an input… [1,2,3].forEach(function (num) { console.log(num); }); …and for each … Read more