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Using an integer as a key in an associative array in JavaScript
... saying. However, note that you can not have integer keys. JavaScript will convert the integer to a string. The following outputs 20, not undefined:
var test = {}
test[2300] = 20;
console.log(test["2300"]);
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delete vs delete[] operators in C++
What is the difference between delete and delete[] operators in C++?
7 Answers
7
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Unix command to prepend text to a file
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This solution has problems ... it converts occurrences of "\n" to actual new lines ... problematic if you're prepending to a code file with strings that contain "\n".
– Paul Go
Mar 17 '16 at 15:16
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What is the difference between memoization and dynamic programming?
What is the difference between memoization and dynamic programming? I think dynamic programming is a subset of memoization. Is it right?
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Using scanf() in C++ programs is faster than using cin?
... a quick test of a simple case: a program to read a list of numbers from standard input and XOR all of the numbers.
iostream version:
#include <iostream>
int main(int argc, char **argv) {
int parity = 0;
int x;
while (std::cin >> x)
parity ^= x;
std::cout << parity...
Which is faster : if (bool) or if(int)?
The above topic made me do some experiments with bool and int in if condition. So just out of curiosity I wrote this program:
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C# LINQ find duplicates in List
... , how can I retrieve a list that contains entries repeated more than once and their values?
9 Answers
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Return a `struct` from a function in C
...ame as any built-in type for purposes of parameter passing, return values, and assignment.
Here's a simple demonstration program that does all three - passes a structure as a parameter, returns a structure from a function, and uses structures in assignment statements:
#include <stdio.h>
str...
What does the comma operator , do?
...ression2)
First expression1 is evaluated, then expression2 is evaluated, and the value of expression2 is returned for the whole expression.
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What is the “double tilde” (~~) operator in JavaScript? [duplicate]
...t will always return a number, and will never give you NaN. If it can't be converted to a number, you'll get 0.
– RightSaidFred
May 11 '11 at 23:27
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