Postgres 9.1 added FOREACH to loop over arrays: DO $do$ DECLARE _arr int[] := ‘{1,2,3,4}’; _elem int; — matching element type BEGIN FOREACH _elem IN ARRAY _arr LOOP RAISE NOTICE ‘%’, _elem; END LOOP; END $do$; db<>fiddle here Works for multi-dimensional arrays, too: Postgres flattens the array and iterates over all elements. To loop over … Read more
same way you did the fill in, but reverse the indexes: >>> for j in range(columns): … for i in range(rows): … print mylist[i][j], … 0,0 1,0 2,0 0,1 1,1 2,1 >>>
Use for…in loop: for (var key in obj) { console.log(‘ name=” + key + ” value=” + obj[key]); // do some more stuff with obj[key] }
Good lord no. Sometimes there is a possibility that something can occur in the loop that satisfies the overall requirement, without satisfying the logical loop condition. In that case, break is used, to stop you cycling around a loop pointlessly. Example String item; for(int x = 0; x < 10; x++) { // Linear search. … Read more
I played around with domi27’s idea and came up with this. I made a nested array as my tree, [‘link’][‘sublinks’] is null or another array of more of the same. Templates The sub-template file to recurse with: <!–includes/menu-links.html–> {% for link in links %} <li> <a href=”https://stackoverflow.com/questions/8326482/{{ link.href }}”>{{ link.name }}</a> {% if link.sublinks %} … Read more
For every python container C, the expectation is that for item in C: assert item in C will pass just fine — wouldn’t you find it astonishing if one sense of in (the loop clause) had a completely different meaning from the other (the presence check)? I sure would! It naturally works that way for … Read more
I believe you probably meant: from __future__ import print_function for song in json_object: # now song is a dictionary for attribute, value in song.items(): print(attribute, value) # example usage NB: You could use song.iteritems instead of song.items if in Python 2.
Here’s a way to do it by making use of the way adding one day causes the date to roll over to the next month if necessary, and without messing around with milliseconds. Daylight savings aren’t an issue either. var now = new Date(); var daysOfYear = []; for (var d = new Date(2012, 0, … Read more
An if statement runs its else clause if its condition evaluates to false. Identically, a while loop runs the else clause if its condition evaluates to false. This rule matches the behavior you described: In normal execution, the while loop repeatedly runs until the condition evaluates to false, and therefore naturally exiting the loop runs … Read more
While vs. Do While