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How to check file MIME type with javascript before upload?
...w FileReader();
fileReader.onloadend = function(e) {
var arr = (new Uint8Array(e.target.result)).subarray(0, 4);
var header = "";
for(var i = 0; i < arr.length; i++) {
header += arr[i].toString(16);
}
console.log(header);
// Check the file signature against known types
};
fileR...
Pretty-print a Map in Java
...
Arrays.toString(map.entrySet().toArray())
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Why is my program slow when looping over exactly 8192 elements?
...hy does the order of the loops affect performance when iterating over a 2D array?
You are iterating the matrix column-wise instead of row-wise.
To solve this problem, you should interchange the two loops.
for(j=1;j<SIZE-1;j++) {
for(i=1;i<SIZE-1;i++) {
res[j][i]=0;
res...
In C#, why is String a reference type that behaves like a value type?
...
Because it just contains a reference to a character array, which is of variable size. Having a value type who's only real "value" was a reference type would just be all the more confusing, as it would still have reference semantics for all intensive purposes.
...
$watch'ing for data changes in an Angular directive
...eep dirty checking is expensive. So if you just need to watch the children array instead of the whole data variable the watch the variable directly.
scope.$watch('val.children', function(newValue, oldValue) {}, true);
version 1.2.x introduced $watchCollection
Shallow watches the properties of...
How to customise file type to syntax associations in Sublime Text?
...bt (the extension of files I want to be opened as Scala code files) to the array after the fileTypes key:
<dict>
<key>bundleUUID</key>
<string>452017E8-0065-49EF-AB9D-7849B27D9367</string>
<key>fileTypes</key>
<array>
<string>scala&l...
How to convert a String to CharSequence?
...
Wrapping a string into an array doesn't help making a point that String is a CharSequence (and hence that array of CharSequence is array of String).
– tishma
May 15 '17 at 8:33
...
What does a \ (backslash) do in PHP (5.3+)?
... optimisation.
The following native functions benefit from this effect:
"array_slice"
"assert"
"boolval"
"call_user_func"
"call_user_func_array"
"chr"
"count"
"defined"
"doubleval"
"floatval"
"func_get_args"
"func_num_args"
"get_called_class"
"get_class"
"gettype"
"in_array"
"intval"
"is_array"
"i...
PHP exec() vs system() vs passthru()
...o the output stream, it gives you the opportunity to put this text in
an array returned in the second parameter to the function:
The shell_exec() Function
Most of the programs we have been executing thus far have been, more
or less, real programs1. However, the environment in which Win...
In c# what does 'where T : class' mean?
...cifically a reference type which could be a class, interface, delegate, or array type).
See this MSDN article for further details.
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