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How can I shift-select multiple checkboxes like GMail?
...ired by the fine answers provided, here's a plain JavaScript version using Array.prototype to coerce nodelists to use array functions, rather than for loops.
(function () { // encapsulating variables with IIFE
var lastcheck = null // no checkboxes clicked yet
// get desired checkboxes
...
Is if(items != null) superfluous before foreach(T item in items)?
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Cute idea; an empty array would be preferable because it consumes less memory and produces less memory pressure. Enumerable.Empty<string> would be even more preferable because it caches the empty array it generates and re-uses it.
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How to swap keys and values in a hash
...ue you can use Hash#invert. If not, then you can keep all the values as an array, like this:
class Hash
# like invert but not lossy
# {"one"=>1,"two"=>2, "1"=>1, "2"=>2}.inverse => {1=>["one", "1"], 2=>["two", "2"]}
def safe_invert
each_with_object({}) do |(key,value...
Creating an object: with or without `new` [duplicate]
...tically; you must destroy it explicitly using the keyword delete;
Creating arrays with a size known only at runtime, since the object creation occurs at runtime. (I won't go into the specifics of allocating dynamic arrays here.)
Neither is preferred; it depends on what you're doing as to which is ...
string c_str() vs. data()
... required to be null-terminated. According to cppreference: "The returned array is null-terminated, that is, data() and c_str() perform the same function."
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PHP shell_exec() vs exec()
...s the last line of the output by default, but can provide all output as an array specifed as the second parameter.
See
http://php.net/manual/en/function.shell-exec.php
http://php.net/manual/en/function.exec.php
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How do you run multiple programs in parallel from a bash script?
... #!/usr/bin/env bash ARRAY='cat bat rat' for ARR in $ARRAY do ./run_script1 $ARR & done P1=$! wait $P1 echo "INFO: Execution of all background processes in the for loop has completed.."
– Yash
Oc...
Is it faster to count down than it is to count up?
...in the loop. If the loop index variable is used only to index into static arrays (arrays of known size at compile time), the array indexing can be done as ptr + array size - loop index var, which can still be a single instruction in x86. It's pretty wild to be debugging assembler and see the loop c...
Glorified classes in the Java language
...timeException and Error.
NullPointerException and other exceptions such as ArrayIndexOutOfBounds which can be thrown by other bytecode instructions than athrow.
Interfaces
Iterable - the only interface that can be used in an enhanced for loop
Honorable mentions goes to:
java.lang.reflect.A...
Long vs Integer, long vs int, what to use and when?
...n inside the function I change the value held in the first element of that array, will the function's caller see that change? Yes? Well that's because what was passed to the function wasn't the values in the array, but rather a reference to those values. "Pass by value" means the actual data themsel...