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How do I check in JavaScript if a value exists at a certain array index?
...ey are named 0 to n - 1, and anything in this range is part of the array.
What you probably want, however, is to know if a value in an array is actually something defined - that is, it's not undefined. Maybe you even want to know if it's defined and not null. It's possible to add members to an ar...
How to get index of object by its property in JavaScript?
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I have to iterate the entire array no matter what. The first method don't need to.
– German Attanasio
Jun 2 '14 at 2:22
1
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Authorative way to override onMeasure()?
What's the correct way of overriding onMeasure()? I've seen various approaches. For example, Professional Android Development uses MeasureSpec to calculate the dimensions, then ends with a call to setMeasuredDimension(). For example:
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Remove useless zero digits from decimals in PHP
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This is what I use:
function TrimTrailingZeroes($nbr) {
return strpos($nbr,'.')!==false ? rtrim(rtrim($nbr,'0'),'.') : $nbr;
}
N.B. This assumes . is the decimal separator. It has the advantage that it will work on arbitrarily...
Best explanation for languages without null
...when programmers are complaining about null errors/exceptions someone asks what we do without null.
11 Answers
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How can I compare two lists in python and return matches
...ension finds the values that appear in both at the SAME positions (this is what SilentGhost meant by "order is significant"). The set intersection solutions will also find matches at DIFFERENT positions. These are answers to 2 quite different questions... (the op's question is ambiguous as to which ...
How can I store my users' passwords safely?
...shing API
Example of code using PHP's password API:
<?php
// $hash is what you would store in your database
$hash = password_hash($_POST['password'], PASSWORD_DEFAULT, ['cost' => 12]);
// $hash would be the $hash (above) stored in your database for this user
$checked = password_verify($_POS...
Android activity life cycle - what are all these methods for?
What is the life cycle of an Android activity? Why are so many similar sounding methods ( onCreate() , onStart() , onResume() ) called during initialization, and so many others ( onPause() , onStop() , onDestroy() ) called at the end?
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WebKit issues with event.layerX and event.layerY
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What's going on!?
"jQuery probably copies those properties into the jQuery object." You're exactly correct, so it sounds like you already know! :)
Hopefully jQuery will update their code to stop touching that, but at the s...
plot a circle with pyplot
...ipped when ever it extends beyond the axes. The third (green) circle shows what happens when you don't clip the Artist. It extends beyond the axes (but not beyond the figure, ie the figure size is not automatically adjusted to plot all of your artists).
The units for x, y and radius correspond to d...