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setTimeout in for-loop does not print consecutive values [duplicate]
...alert(i); }, 100);
}
for (var i = 1; i <= 2; ++i)
doSetTimeout(i);
If you don't do something like this (and there are other variations on this same idea), then each of the timer handler functions will share the same variable "i". When the loop is finished, what's the value of "i"? It's 3! ...
Difference between Select and ConvertAll in C#
...
And what about the performances? If I have a List, is it more performant to use ConvertAll or Select?
– Nicolas
Dec 7 '10 at 14:28
...
How to find the sum of an array of numbers
...(function(acc, val) { return acc + val; }, 0)
)
Non-number inputs
If non-numbers are possible inputs, you may want to handle that?
console.log(
["hi", 1, 2, "frog"].reduce((a, b) => a + b)
)
let numOr0 = n => isNaN(n) ? 0 : n
console.log(
["hi", 1, 2, "frog"].reduce((...
instantiate a class from a variable in PHP?
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If you work with namespace, put the current namespace into the string: $var = __NAMESPACE__ . '\\' . $var . 'Class';
– bastey
Sep 2 '13 at 13:28
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How can I pad an integer with zeros on the left?
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If you have to do this for a large list of values, performance of DecimalFormat is at least 3 times better than String.format(). I'm in the process of doing some performance tuning myself and running the two in Visual VM sho...
Create a “with” block on several context managers? [duplicate]
...() as Z:
do_something()
This is normally the best method to use, but if you have an unknown-length list of context managers you'll need one of the below methods.
In Python 3.3, you can enter an unknown-length list of context managers by using contextlib.ExitStack:
with ExitStack() as stack...
Where to place JavaScript in an HTML file?
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For example, if you're going to be doing a bunch of jQuery stuff, you would need the library loaded before you actually try to make use of it.
– BryanH
Jul 8 '09 at 22:09
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Why do I get the error “Unsafe code may only appear if compiling with /unsafe”?
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@Nick: Yes, if you publish code to be compiled dynamically, then the project settings doesn't apply. See stackoverflow.com/questions/16567197/…
– Guffa
Sep 17 '13 at 14:41
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Where Is Machine.Config?
...rop in replacements so don't have their own framework directories. Oh, and if you're unlucky enough to still be using .NET 1.1 then there may be a Framework/v1.1.4322 directory.
– Scott Lerch
May 19 '14 at 21:29
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Prevent Default on Form Submit jQuery
...() {
$('form').on('submit', function(e){
// validation code here
if(!valid) {
e.preventDefault();
}
});
});
Cite: https://api.jquery.com/on/
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