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Convert NSArray to NSString in Objective-C
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NSString * result = [[array valueForKey:@"description"] componentsJoinedByString:@""];
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Immutability of Strings in Java
...ct - the string "Hello" - but that object is immutable and thus cannot be altered.
If we do something like this:
s1 = "Help!";
System.out.println(s2); // still prints "Hello"
Here we see the difference between mutating an object, and changing a reference. s2 still points to the same object as we in...
Android JSONObject - How can I loop through a flat JSON object to get each key and value
...tor to iterate over all the properties, and call get() for each.
Iterator<String> iter = json.keys();
while (iter.hasNext()) {
String key = iter.next();
try {
Object value = json.get(key);
} catch (JSONException e) {
// Something went wrong!
}
}
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What is size_t in C?
...andard itself is much more clear: it defines size_t as the type of the result of the sizeof operator (7.17p2 about <stddef.h>). Section 6.5 explains exactly how C expressions work (6.5.3.4 for sizeof). Since you cannot apply sizeof to a disk file (mostly because C doesn't even define how disks...
How to get string objects instead of Unicode from JSON?
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object_hook is an optional function that will be called with the result of any object literal decoded (a dict). The return value of object_hook will be used instead of the dict. This feature can be used to implement custom decoders
Since dictionaries nested many levels deep in other dictiona...
When should you use a class vs a struct in C++?
...Differences between a class and a struct in C++ are that structs have default public members and bases and classes have default private members and bases. Both classes and structs can have a mixture of public, protected and private members, can use inheritance and can have member functions.
I would...
Get MD5 hash of big files in Python
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Break the file into 8192-byte chunks (or some other multiple of 128 bytes) and feed them to MD5 consecutively using update().
This takes advantage of the fact that MD5 has 128-byte digest blocks (8192 is 128×64). Since you're not reading the entire file into memory, this won't...
Object comparison in JavaScript [duplicate]
...ed in constructor.
// Comparing dates is a common scenario. Another built-ins?
// We can even handle functions passed across iframes
if ((typeof x === 'function' && typeof y === 'function') ||
(x instanceof Date && y instanceof Date) ||
(x instanceof RegExp ...
How to use sessions in an ASP.NET MVC 4 application?
...hat you have stored to a session
var products=Session["products"] as List<Product>;
//to clear the session value
Session["products"]=null;
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Breaking loop when “warnings()” appear in R
I am having an issue:
I am running a loop to process multiple files. My matrices are enormous and therefore I often run out of memory if I am not careful.
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