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Hash Code and Checksum - what's the difference?
... @gumbo: no, not every hashcode is a checksum. See string example from MSalters below.
– MarcH
Mar 17 '16 at 16:18
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Clearing all cookies with JavaScript
...knocked together this function which will attempt to delete a named cookie from all paths. Just call this for each of your cookies and you should be closer to deleting every cookie then you were before.
function eraseCookieFromAllPaths(name) {
// This function will attempt to remove a cookie f...
Why doesn't a python dict.update() return the object?
...kes extensive use of chaining. Its not discouraged, you could even inherit from dict and only override update to do update and return self, if you really want it.
class myDict(dict):
def update(self, *args):
dict.update(self, *args)
return self
...
Double Negation in C++
...actually a very useful idiom in some contexts. Take these macros (example from the Linux kernel). For GCC, they're implemented as follows:
#define likely(cond) (__builtin_expect(!!(cond), 1))
#define unlikely(cond) (__builtin_expect(!!(cond), 0))
Why do they have to do this? GCC's __builtin_...
How to create a checkbox with a clickable label?
...ribute, and it will be assumed that it is for the input within it.
Excerpt from w3.org (with my emphasis):
[The for attribute] explicitly associates the label being defined with another control. When present, the value of this attribute must be the same as the value of the id attribute of some othe...
Get the index of the nth occurrence of a string?
... (IndexOf will return as soon as it finds the match, and you'll keep going from where it left off.)
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Find and kill a process in one line using bash and regex
...n't find it because it's looking for the regular expression "any character from the character class [s] (which is s) followed by leep.
In other words, it's looking for sleep but the grep process is grep '[s]leep' which doesn't have sleep in it.
When I was shown this (by someone here on SO), I imme...
Regular vs Context Free Grammars
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First: Regular grammars can be ambiguous (example from Kai Kuchenbecker: S -> aA | aB, B -> a, A -> a). The only thing is that there is only one way the nodes in the syntax tree can be positioned (for instance the associativity ambiguity does not exist when a regula...
How to cancel/abort jQuery AJAX request?
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You can use jquery-validate.js . The following is the code snippet from jquery-validate.js.
// ajax mode: abort
// usage: $.ajax({ mode: "abort"[, port: "uniqueport"]});
// if mode:"abort" is used, the previous request on that port (port can be undefined) is aborted via XMLHttpRequest.abort...
JavaScript listener, “keypress” doesn't detect backspace?
...e backspace key only fires a keydown event but the character isn't removed from the input until sometime after that.
– jxmallett
Apr 15 '15 at 0:24
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