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What is the purpose of .PHONY in a Makefile?
... files at both the side of ':' symbol in a rule.
Example
In a directory 'test' following files are present:
prerit@vvdn105:~/test$ ls
hello hello.c makefile
In makefile a rule is defined as follows:
hello:hello.c
cc hello.c -o hello
Now assume that file 'hello' is a text file containin...
JavaScript isset() equivalent
...T pass a function to our isset() that returns the value we're
// trying to test(ES6 arrow function)
isset(() => some) // false
// Defining objects
let some = { nested: { value: 'hello' } }
// More tests that never throw an error
isset(() => some) // true
isset(() => some.nested) // true
i...
Can I use git diff on untracked files?
...ince I really only use it interactively, I'm OK with a hack:
d() {
if test "$#" = 0; then
(
git diff --color
git ls-files --others --exclude-standard |
while read -r i; do git diff --color -- /dev/null "$i"; done
) | `git config --get core...
Avoiding if statement inside a for loop?
...rry about in terms of performance
In this case I advocate for keeping the test inside the loop for clarity.
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Convert string in base64 to image and save on filesystem in Python
... @Oleg Tarasenko, I had a typo in the second method. I fiexed it and tested it on your string and it works.
– John La Rooy
Feb 25 '10 at 21:13
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Generate an integer that is not among four billion given ones
...I used it in my own answer) but it's not obvious to everybody. It's a good test to see if you can spot obvious solutions or if you're going to over-complicate everything you touch.
– Mark Ransom
Aug 23 '11 at 17:00
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How to detect if a function is called as constructor?
...s made available to the executing code, so the only thing it's possible to test inside x is the this value, which is what all the answers here are doing. As you've observed, a new instance of* x when calling x as a constructor is indistinguishable from a pre-existing instance of x passed as this whe...
Call Javascript function from URL/address bar
...
/test.html#alert('heello')
test.html
<button onClick="eval(document.location.hash.substring(1))">do it</button>
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Firefox session cookies
...ies from months ago that were set by sites I always have open in tabs.
To test this out, close all the tabs in your browser, then close the browser and restart it. I think the session cookies for your site should clear in that case. Otherwise you'd have to turn off session restore.
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C# Object Pooling Pattern implementation
...e this to minimize locking, and I hope I haven't made any mistakes (I have tested this under multi-threaded conditions, but obviously not exhaustively).
You might be wondering why none of these methods bother checking to see whether or not the store has reached the maximum size. I'll get to that i...