Advantages of std::for_each over for loop
Are there any advantages of std::for_each over for loop? To me, std::for_each only seems to hinder the readability of code. Why do then some coding standards recommend its use? 22 Answers 22
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Java 8 forEach with index [duplicate]
This question already has answers here: Is there a concise way to iterate over a stream with indices in Java 8? (23 answers) Closed 8 years ago. Is there a way to build a forEach method in Java 8 that iterates with an index? Ideally I’d like something like this: params.forEach((idx, e) -> query.bind(idx, e)); … Read more
JavaScript: Difference between .forEach() and .map()
I know that there were a lot of topics like this. And I know the basics: .forEach() operates on original array and .map() on the new one. In my case: function practice (i){ return i+1; }; var a = [ -1, 0, 1, 2, 3, 4, 5 ]; var b = [ 0 ]; var … Read more
JavaScript foreach loop on an associative array object
Why is my for for-each loop not iterating over my JavaScript associative array object? // Defining an array var array = []; // Assigning values to corresponding keys array[“Main”] = “Main page”; array[“Guide”] = “Guide page”; array[“Articles”] = “Articles page”; array[“Forum”] = “Forum board”; // Expected: loop over every item, // yet it logs only … Read more
`break` and `continue` in `forEach` in Kotlin
Kotlin has very nice iterating functions, like forEach or repeat, but I am not able to make the break and continue operators work with them (both local and non-local): repeat(5) { break } (1..5).forEach { continue@forEach } The goal is to mimic usual loops with the functional syntax as close as it might be. It … Read more
Is there a ‘foreach’ function in Python 3?
When I meet the situation I can do it in javascript, I always think if there’s an foreach function it would be convenience. By foreach I mean the function which is described below: def foreach(fn,iterable): for x in iterable: fn(x) they just do it on every element and didn’t yield or return something,i think it … Read more
Which is more efficient, a for-each loop, or an iterator?
Which is the most efficient way to traverse a collection? List<Integer> a = new ArrayList<Integer>(); for (Integer integer : a) { integer.toString(); } or List<Integer> a = new ArrayList<Integer>(); for (Iterator iterator = a.iterator(); iterator.hasNext();) { Integer integer = (Integer) iterator.next(); integer.toString(); } Please note, that this is not an exact duplicate of this, this, … Read more
TypeScript for … of with index / key?
As described here TypeScript introduces a foreach loop: var someArray = [9, 2, 5]; for (var item of someArray) { console.log(item); // 9,2,5 } But isn’t there any index/key? I would expect something like: for (var item, key of someArray) { … } 5 Answers 5
“for” vs “each” in Ruby
I just had a quick question regarding loops in Ruby. Is there a difference between these two ways of iterating through a collection? # way 1 @collection.each do |item| # do whatever end # way 2 for item in @collection # do whatever end Just wondering if these are exactly the same or if maybe … Read more
Is there a way to iterate over a dictionary?
I know NSDictionaries as something where you need a key in order to get a value. But how can I iterate over all keys and values in a NSDictionary, so that I know what keys there are, and what values there are? I know there is something called a for-in-loop in JavaScript. Is there something … Read more