The render method of your component, or your stateless component function, returns the elements to be rendered. If you want to use a loop, that’s fine: render() { let menuItems = []; for (var i = 0; i < Users.length; i++) { menuItems.push(<MenuItem eventKey=[i]>User.firstname[i]</MenuItem>); } return <div>{menuItems}</div>; } More common would be to see a … Read more
There is no difference. From perldoc perlsyn: The foreach keyword is actually a synonym for the for keyword, so you can use foreach for readability or for for brevity.
You probably want a dict instead of separate variables. For example d = {} for i in range(3): d[“group” + str(i)] = self.getGroup(selected, header+i) If you insist on actually modifying local variables, you could use the locals function: for i in range(3): locals()[“group”+str(i)] = self.getGroup(selected, header+i) On the other hand, if what you actually want … Read more
You can use a dict comprehension: data = {smallItem:smallItem for smallItem in bigList} You might also use dict and a generator expression: data = dict((smallItem, smallItem) for smallItem in bigList) But the dict comprehension will be faster. As for converting this into a JSON string, you can use json.dumps.
Swift 5 If you need a loop with dynamic value-range, I suggest that using stride(to:by:) instead of ..< or … Basically ..< or … will be crashed if start_index > end_index. This will be crash: let k = 5 for i in 10…k { print(“i=\(i)”) } for i in 10..<k { print(“i=\(i)”) } How to … Read more
One approach is using Array.prototype.entries(): for (const [i, value] of arr.entries()) { if (i === arr.length – 1) { // do your thing } } Another way is keeping a count outside the loop like Shidersz suggested. I don’t think you want to check indexOf(item) though because that poses a problem if the last item … Read more
Maybe notify mongooose the dataset has changed like this : doc.markModified(‘pathToYourAttribute’) From the docs http://mongoosejs.com/docs/schematypes.html person.anything = { x: [3, 4, { y: “changed” }] }; person.markModified(‘anything’); Hope it helps!
Hard to say from your question. I’d interpret it that you want to skip the rest of the iterations of the inner loop and continue the outer loop? for (int i = 0; i < [arABFBmatches count]; i++) { for (int j = 0; j < [arABFBmatches count]; j++) { if (should_skip_rest) break; // let … Read more
what about this? for (int i = dictSummary.Count – 1; i >= 0; i–) { var item = dictSummary.ElementAt(i); var itemKey = item.Key; var itemValue = item.Value; }
If you’re frequently iterating over a Cartesian product like in your example, you might want to investigate Python 2.6’s itertools.product — or write your own if you’re in an earlier Python. from itertools import product for y, x in product(range(3), repeat=2): do_something() for y1, x1 in product(range(3), repeat=2): do_something_else()