Questions tagged [iteration]
Iterations are the successive repetitions in loops such as for, foreach or while. Questions with this tag are often concerned about how to best handle a collection of data.
iteration
10,911
questions
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41
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5.4m
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Loop (for each) over an array in JavaScript
How can I loop through all the entries in an array using JavaScript?
- 59.4k
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votes
46
answers
3.4m
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How do I efficiently iterate over each entry in a Java Map?
If I have an object implementing the Map interface in Java and I wish to iterate over every pair contained within it, what is the most efficient way of going through the map?
Will the ordering of ...
- 38.9k
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votes
7
answers
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Iterate through a HashMap [duplicate]
What's the best way to iterate over the items in a HashMap?
- 57.8k
2282
votes
7
answers
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How does PHP 'foreach' actually work?
Let me prefix this by saying that I know what foreach is, does and how to use it. This question concerns how it works under the bonnet, and I don't want any answers along the lines of "this is how you ...
- 88.4k
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Why is using "for...in" for array iteration a bad idea?
I've been told not to use for...in with arrays in JavaScript. Why not?
- 57.8k
1301
votes
31
answers
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Iterating through a Collection, avoiding ConcurrentModificationException when removing objects in a loop
We all know you can't do the following because of ConcurrentModificationException:
for (Object i : l) {
if (condition(i)) {
l.remove(i);
}
}
But this apparently works sometimes, but ...
- 227k
931
votes
25
answers
934k
views
How to remove items from a list while iterating?
I'm iterating over a list of tuples in Python, and am attempting to remove them if they meet certain criteria.
for tup in somelist:
if determine(tup):
code_to_remove_tup
What should I ...
- 50.4k
721
votes
13
answers
1.3m
views
Ways to iterate over a list in Java
Being somewhat new to the Java language I'm trying to familiarize myself with all the ways (or at least the non-pathological ones) that one might iterate through a list (or perhaps other collections) ...
- 11.4k
657
votes
19
answers
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How to iterate over a JavaScript object?
I have an object in JavaScript:
{
abc: '...',
bca: '...',
zzz: '...',
xxx: '...',
ccc: '...',
// ...
}
I want to use a for loop to get its properties. And I want to iterate ...
- 10.9k
586
votes
9
answers
837k
views
Iterating each character in a string using Python
How can I iterate over a string in Python (get each character from the string, one at a time, each time through a loop)?
- 8,119
570
votes
15
answers
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What are iterator, iterable, and iteration?
What are "iterable", "iterator", and "iteration" in Python? How are they defined?
See also: How to build a basic iterator?
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28
answers
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Iterating through a range of dates in Python
I have the following code to do this, but how can I do it better? Right now I think it's better than nested loops, but it starts to get Perl-one-linerish when you have a generator in a list ...
- 6,105
485
votes
17
answers
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What is the easiest/best/most correct way to iterate through the characters of a string in Java?
Some ways to iterate through the characters of a string in Java are:
Using StringTokenizer?
Converting the String to a char[] and iterating over that.
What is the easiest/best/most correct way to ...
- 64.8k
469
votes
5
answers
278k
views
How to skip to next iteration in jQuery.each() util?
I'm trying to iterate through an array of elements. jQuery's documentation says:
jquery.Each() documentation
Returning non-false is the same as a continue statement in a for loop, it will skip ...
- 5,331
468
votes
8
answers
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How do I iterate over an NSArray?
I'm looking for the standard idiom to iterate over an NSArray. My code needs to be suitable for OS X 10.4+.
- 52.2k