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Insert code into the page context using a content script
...
Underlying cause:
Content scripts are executed in an "isolated world" environment.
Solution::
To access functions/variables of the page context ("main world") you have to inject the code that wants to access them into the page itself. Same thing if you want to expose your functions/variab...
Fastest way to tell if two files have the same contents in Unix/Linux?
...ll script in which I need to check whether two files contain the same data or not. I do this a for a lot of files, and in my script the diff command seems to be the performance bottleneck.
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How do I delete an item or object from an array using ng-click?
...son this is undefined. Plunker/jsfiddle perhaps?
– Tjorriemorrie
Sep 19 '13 at 10:59
11
.indexOf(...
Receiving “fatal: Not a git repository” when attempting to remote add a Git repo
I am introducing myself to Git by following this tutorial:
27 Answers
27
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Should I use alias or alias_method?
...e redefined if need be. (it's defined in the Module class.)
alias's behavior changes depending on its scope and can be quite unpredictable at times.
Verdict: Use alias_method - it gives you a ton more flexibility.
Usage:
def foo
"foo"
end
alias_method :baz, :foo
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What is a non-capturing group in regular expressions?
...g groups, i.e. (?:) , used in regular expressions and what are they good for?
15 Answers
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Difference between declaring variables before or in loop?
I have always wondered if, in general, declaring a throw-away variable before a loop, as opposed to repeatedly inside the loop, makes any (performance) difference?
A (quite pointless) example in Java:
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How to check if function exists in JavaScript?
...typeof me.onChange !== "undefined") {
// safe to use the function
}
or better yet (as per UpTheCreek upvoted comment)
if (typeof me.onChange === "function") {
// safe to use the function
}
share
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Can pandas automatically recognize dates?
...ositively surprised by the fact that while reading data from a data file (for example) pandas is able to recognize types of values:
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Check Whether a User Exists
...o check if the user exists, use if with id directly, as if already checks for the exit code. There's no need to fiddle with strings, [, $? or $():
if id "$1" &>/dev/null; then
echo 'user found'
else
echo 'user not found'
fi
(no need to use -u as you're discarding the output anyway)
A...