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How to generate random SHA1 hash to use as ID in node.js?
... in modern browsers, if you'd like
// str byteToHex(uint8 byte)
// converts a single byte to a hex string
function byteToHex(byte) {
return ('0' + byte.toString(16)).slice(-2);
}
// str generateId(int len);
// len - must be an even number (default: 40)
function generateId(len = ...
Log to the base 2 in python
....log(x, 2.0)
log2 = math.log2(x) # python 3.4 or later
Thanks @akashchandrakar and @unutbu.
float → int math.frexp(x)
If all you need is the integer part of log base 2 of a floating point number, extracting the exponent is pretty efficient:
log2int_slow = int(math.floor(math.log(x, 2.0)...
Android, getting resource ID from string?
...ne of my classes. It needs to use both the id that the reference points to and also it needs the string. How should I best achieve this?
...
Why does an overridden function in the derived class hide other overloads of the base class?
...ding happens, people who respond either say that this called "name hiding" and explain how it works (which you probably already know), or explain how to override it (which you never asked about), but nobody seems to care to address the actual "why" question.
The decision, the rationale behind the n...
Static Initialization Blocks
...the constructor's job to initialize fields.
– Martin Andersson
Apr 1 '13 at 18:56
2
...
How to get element by innerText
...electorAll(haystack), 0);
}
// if haystack has a length property, we convert it to an Array
// (if it's already an array, this is pointless, but not harmful):
else if (haystack.length) {
elems = [].slice.call(haystack, 0);
}
// work out whether we're looking at innerText (IE...
Are members of a C++ struct initialized to 0 by default?
...(0),y(0) { }
// other ctors / functions...
};
Will initialize both x and y to 0. Note that you can use x(), y() to initialize them disregarding of their type: That's then value initialization, and usually yields a proper initial value (0 for int, 0.0 for double, calling the default constructor...
How to get duration, as int milli's and float seconds from ?
I'm trying to use chrono library for timers and durations.
4 Answers
4
...
Create an enum with string values
...at way it will return the string value whenever accessed and not just when converting toString().
– John
Feb 28 '14 at 23:37
...
How to copy text programmatically in my Android app?
I'm building an Android app and I want to copy the text value of an EditText widget. It's possible for the user to press Menu+A then Menu+C to copy the value, but how would I do this programmatically?
...