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Subtract two variables in Bash
...xpr $FIRSTV - $SECONDV`
Be aware of the exit status:
The exit status is 0 if EXPRESSION is neither null nor 0, 1 if EXPRESSION is null or 0.
Keep this in mind when using the expression in a bash script in combination with set -e which will exit immediately if a command exits with a non-zero stat...
Constructors in JavaScript objects
...
409
Using prototypes:
function Box(color) // Constructor
{
this.color = color;
}
Box.prototyp...
github locks up mac terminal when using pull command
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answered Dec 26 '12 at 20:57
ceykoceyko
4,69711 gold badge1515 silver badges2323 bronze badges
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Merge (with squash) all changes from another branch as a single commit
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Ioannis Filippidis
7,35866 gold badges6060 silver badges9393 bronze badges
answered Sep 13 '10 at 0:28
fsetofseto
8,3...
What is the difference between a var and val definition in Scala?
...ry if some other part of your code is changing it. For example:
x = new B(0)
f(x)
if (x.value.value == 0)
println("f didn't do anything to x")
else
println("f did something to x")
This becomes particularly important with multithreaded systems. In a multithreaded system, the following can happ...
What's the difference between utf8_general_ci and utf8_unicode_ci?
... have updated Unicode sorting rules, available under names such as utf8mb4_0900_ai_ci for equivalent rules based on Unicode 9.0 - and with no equivalent _general variant. People reading this now should probably use one of these newer collations instead of either _unicode or _general. Much of what's ...
How to get distinct values from an array of objects in JavaScript?
...stead, try this:
var flags = [], output = [], l = array.length, i;
for( i=0; i<l; i++) {
if( flags[array[i].age]) continue;
flags[array[i].age] = true;
output.push(array[i].age);
}
share
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Calculate business days
...s days" in PHP. For example, Friday 12/5 + 3 business days = Wednesday 12/10.
36 Answers
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Delete all local changesets and revert to tree
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answered Jan 27 '10 at 0:18
just somebodyjust somebody
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How do you set your pythonpath in an already-created virtualenv?
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edited Oct 17 '18 at 20:33
answered Jan 21 '11 at 11:39
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