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How does inline Javascript (in HTML) work?
...
The best way to answer your question is to see it in action.
<a id="test" onclick="alert('test')"> test </a>
In the js
var test = document.getElementById('test');
console.log( test.onclick );
As you see in the console, if you're using chrome it prints an anonymous function...
Python Progress Bar
...he best points of all the above, and made it into a function, along with a test cases.
To use it, just copy the lines under "def update_progress(progress)" but not the test script. Don't forget to import sys. Call this whenever you need to display or update the progress bar.
This works by directly...
List of Big-O for PHP functions
...ose who doubt that PHP array lookups are O(N), I've written a benchmark to test that (they are still effectively O(1) for most realistic values).
$tests = 1000000;
$max = 5000001;
for( $i = 1; $i <= $max; $i += 10000 ) {
//create lookup array
$array = array_fill( 0, $i, NULL );
...
Should I use multiplication or division?
...gh"--Note which user requirement/story requires that metric.
Write a speed test
Test existing code--If it's fast enough, you're done.
Recode it optimized
Test optimized code. IF it doesn't meet the metric, throw it away and keep the original.
If it meets the test, keep the original code in as comme...
What exactly does the “u” do? “git push -u origin master” vs “git push origin master”
....
To see the difference, let's use a new empty branch:
$ git checkout -b test
First, we push without -u:
$ git push origin test
$ git pull
You asked me to pull without telling me which branch you
want to merge with, and 'branch.test.merge' in
your configuration file does not tell me, either. Pl...
One line if-condition-assignment
...
you can use one of the following:
(falseVal, trueVal)[TEST]
TEST and trueVal or falseVal
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Shell equality operators (=, ==, -eq)
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It depends on the Test Construct around the operator. Your options are double parenthesis, double braces, single braces, or test
If you use ((...)), you are testing arithmetic equity with == as in C:
$ (( 1==1 )); echo $?
0
$ (( 1==2 )); ec...
Logic to test that 3 of 4 are True
...u want to use this logic in a programming language, my suggestion is
bool test(bool a, bool b, bool c, bool d){
int n1 = a ? 1 : 0;
int n2 = b ? 1 : 0;
int n3 = c ? 1 : 0;
int n4 = d ? 1 : 0;
return n1 + n2 + n3 + n4 == 3;
}
Or if you want, you can put all of these in a singl...
Why do you need to invoke an anonymous function on the same line?
...y inside the mySum function body, not outside. See following example:
var test1 = function test2() { alert(typeof test2); }
alert(typeof(test2)); //alerts 'undefined', surprise!
test1(); //alerts 'function' because test2 is a function.
Live Demo
Compare this to
function test1() { alert(type...
Nullable vs. int? - Is there any difference?
...ory details see this question, but to give you a quick example here:
void Test<T>(T a, bool b)
{
var test = a is int? & b; // does not compile
var test2 = a is Nullable<int> & b; // does compile
}
The first line gives the following error messages:
erro...