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How to find nth occurrence of character in a string?
...ng substr, int n) {
int pos = str.indexOf(substr);
while (--n > 0 && pos != -1)
pos = str.indexOf(substr, pos + 1);
return pos;
}
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How do I change an HTML selected option using JavaScript?
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10 Answers
10
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Reset select2 value and show placeholder
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edited Jan 24 '17 at 15:20
Hakan Fıstık
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answe...
Where can I find the TypeScript version installed in Visual Studio?
... Visual Studio Command Prompt
Type tsc -v and hit Enter
Visual Studio 2017 versions 15.3 and above bind the TypeScript version to individual projects, as this answer points out:
Right click on the project node in Solution Explorer
Click Properties
Go to the TypeScript Build tab
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Javascript: negative lookbehind equivalent?
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Lookbehind Assertions got accepted into the ECMAScript specification in 2018.
Positive lookbehind usage:
console.log(
"$9.99 €8.47".match(/(?<=\$)\d+(\.\d*)?/) // Matches "9.99"
);
Negative lookbehind usage:
console.log(
"$9.99 €8.47".match(/(?<!\$)\d+(?:\.\d*)/)...
How to delete duplicate lines in a file without sorting it in Unix?
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300
awk '!seen[$0]++' file.txt
seen is an associative-array that Awk will pass every line of the f...
Liquibase lock - reasons?
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601
Sometimes if the update application is abruptly stopped, then the lock remains stuck.
Then run...
How to scale a UIImageView proportionally?
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Srikar Appalaraju
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answered Feb 20 '10 at 0:29
Ken AbramsKen Abrams
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Different ways of clearing lists
..., 3]
>>> b = a
>>> del a[:] # equivalent to del a[0:len(a)]
>>> print(a)
[]
>>> print(b)
[]
>>> a is b
True
You could also do:
>>> a[:] = []
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