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How to check if a variable is an integer in JavaScript?
... && (function(x) { return (x | 0) === x; })(parseFloat(value))
}
Tests:
isInt(42) // true
isInt("42") // true
isInt(4e2) // true
isInt("4e2") // true
isInt(" 1 ") // true
isInt("") // false
isInt(" ") // false
isInt(42.1) // false
isInt("1a") ...
How to check if a file contains a specific string using Bash
... /bin/true; then ...; fi
[[ is an internal bash command dedicated to some tests, like file existence, variable comparisons. Similarly [ is an external command (it is located typically in /usr/bin/[) that performs roughly the same tests but needs ] as a final argument, which is why ] must be padded ...
Pass ruby script file to rails console
...
script/console --irb=pry < test.rb > test.log
simple, dirty, and block the process at the end, but it does the job exactly like I wanted.
share
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How to set current working directory to the directory of the script in bash?
...l characters won't break the command. Try e.g. create the file via touch "-test" and touch -- -test, then remove the file via rm "-test" and rm -- -test, and see the difference.
– kenorb
Jun 12 '14 at 8:15
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How to remove a file from the index in git?
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This removes the latest change for the specific file but keeps it in the repo (remote) after commit and push.
– powder366
Jun 30 '16 at 6:25
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For..In loops in JavaScript - key value pairs
...ly or with Babel (js compiler) then you could do the following:
const test = {a: 1, b: 2, c: 3};
for (const [key, value] of Object.entries(test)) {
console.log(key, value);
}
Which will print out this output:
a 1
b 2
c 3
The Object.entries() method returns an array of a given o...
Add st, nd, rd and th (ordinal) suffix to a number
...
It worked really well for mine as well: dateString = monthNames[newValue.getUTCMonth()] + " " + numberSuffix(newValue.getUTCDate()) + ", " + newValue.getUTCFullYear();
– Michael J. Calkins
Jan 27 '13 at 19:07
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Find the min/max element of an Array in JavaScript
...y work on strings. Your future colleague tries to get the alphabetically-latest string in an array with the now-well-documented native .max() method, but mysteriously gets NaN. Hours later, she finds this code, runs a git blame, and curses your name.
– Mark Amery
...
What is uintptr_t data type
...add one very good use for uintptr_t (or even intptr_t) and that is writing testable embedded code.
I write mostly embedded code targeted at various arm and currently tensilica processors. These have various native bus width and the tensilica is actually a Harvard architecture with separate code and...
Best JavaScript compressor [closed]
...pressor and Google Closure, it compresses better than YUI on all scripts I tested it on, and it's safer than Closure (knows to deal with "eval" or "with").
Other than whitespace removal, UglifyJS also does the following:
changes local variable names (usually to single characters)
joins consecutiv...