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Creating an object: with or without `new` [duplicate]
... might have already been asked (say, here ); yet I still don't understand it. So, let me ask it.
2 Answers
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How do I test if a string is empty in Objective-C?
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You can check if [string length] == 0. This will check if it's a valid but empty string (@"") as well as if it's nil, since calling length on nil will also return 0.
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When to use Tornado, when to use Twisted / Cyclone / GEvent / other [closed]
... to scale easly.
What solution will give the best performance / scalability / most useful framework (in terms of easy of use and easy of developing)?
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How do I split a string on a delimiter in Bash?
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You can set the internal field separator (IFS) variable, and then let it parse into an array. When this happens in a command, then the assignment to IFS only takes place to that single command's environment (to read ). It then parses the input according to the IFS variable value into an array, ...
CABasicAnimation resets to initial value after animation completes
I am rotating a CALayer and trying to stop it at its final position after animation is completed.
15 Answers
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design a stack such that getMinimum( ) should be O(1)
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EDIT: This fails the "constant space" constraint - it basically doubles the space required. I very much doubt that there's a solution which doesn't do that though, without wrecking the runtime complexity somewhere (e.g. making ...
Remove a symlink to a directory
...ory. I want to get rid of that symlink, while keeping the directory behind it.
9 Answers
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How to convert string into float in JavaScript?
...f they're meant to be separate values, try this:
var values = "554,20".split(",")
var v1 = parseFloat(values[0])
var v2 = parseFloat(values[1])
If they're meant to be a single value (like in French, where one-half is written 0,5)
var value = parseFloat("554,20".replace(",", "."));
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Random shuffling of an array
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Using Collections to shuffle an array of primitive types is a bit of an overkill...
It is simple enough to implement the function yourself, using for example the Fisher–Yates shuffle:
import java.util.*;
import java.util.concurrent.ThreadLocalRandom;
class Test
{
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Adding a new entry to the PATH variable in ZSH
...Here, add this line to .zshrc:
export PATH=/home/david/pear/bin:$PATH
EDIT: This does work, but ony's answer below is better, as it takes advantage of the structured interface ZSH provides for variables like $PATH. This approach is standard for bash, but as far as I know, there is no reason to us...