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Check if a variable is of function type
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With updated performance tests it looks like there's a huge speed difference depending on your browser. In Chrome typeof(obj) === 'function' appears to be the fastest by far; however, in Firefox obj instanceof Function is the clear winner.
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Parse JSON String into a Particular Object Prototype in JavaScript
...AN BE OVERLOADED WITH AN OBJECT
{
this.a = 3;
this.b = 2;
this.test = function() {return this.a*this.b;};
// IF AN OBJECT WAS PASSED THEN INITIALISE PROPERTIES FROM THAT OBJECT
for (var prop in obj) this[prop] = obj[prop];
}
var fooObj = new Foo();
alert(fooObj.test() ); //Prin...
MongoDB not equal to
... standard operator:
An examples for $ne, which stands for not equal:
use test
switched to db test
db.test.insert({author : 'me', post: ""})
db.test.insert({author : 'you', post: "how to query"})
db.test.find({'post': {$ne : ""}})
{ "_id" : ObjectId("4f68b1a7768972d396fe2268"), "author" : "you", "p...
Is < faster than
...comparisons will be typically implemented in two machine instructions:
A test or cmp instruction, which sets EFLAGS
And a Jcc (jump) instruction, depending on the comparison type (and code layout):
jne - Jump if not equal --> ZF = 0
jz - Jump if zero (equal) --> ZF = 1
jg - Jump if greater ...
How can prepared statements protect from SQL injection attacks?
...it is meant for performance reasons, not for preventing injection via psql scripts. For psql access, could give permissions to stored procedures and bind the parameters within the procs.
– Glenn
Nov 13 '15 at 3:26
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HTTP test server accepting GET/POST requests
I need a live test server that accepts my requests for basic information via HTTP GET and also allows me to POST (even if it's really not doing anything). This is entirely for test purposes.
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jQuery: Test if checkbox is NOT checked
...heckSurfaceEnvironment').not(':checked') returns an array of DOM elements. Testing this with 'if' returns 'true' even if there was no match to the selector and the array is empty. The only way your answer could be correct is if you tested i$('#checkSurfaceEnvironment').not(':checked').length, which ...
How to check if a String contains only ASCII?
...s with a value outside of the ASCII range. So the method still succeeds in testing for ASCII, even for strings containing emoji's.
For earlier Guava versions without the ascii() method you may write:
boolean isAscii = CharMatcher.ASCII.matchesAllOf(someString);
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How do I squash two non-consecutive commits?
...what you want the new commit message to look like. I recommend this be a description of the changes in commit A and D:
new_commit_message_for_A_and_D
Type Esc then ZZ
git log --oneline -4
E new_commit_message_for_A_and_D
C commit_message_for_C
B commit_message_for_B
git show E
(You should se...
Test if a string contains any of the strings from an array
How do I test a string to see if it contains any of the strings from an array?
14 Answers
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