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How do I check if a directory exists? “is_dir”, “file_exists” or both?
I want to create a directory if it does'nt exist already.
12 Answers
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How to check if an object is an array?
...rite a function that either accepts a list of strings, or a single string. If it's a string, then I want to convert it to an array with just the one item so I can loop over it without fear of an error.
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How to get complete month name from DateTime
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Use the "MMMM" custom format specifier:
DateTime.Now.ToString("MMMM");
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Add an element to an array in Swift
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As of Swift 3 / 4 / 5, this is done as follows.
To add a new element to the end of an Array.
anArray.append("This String")
To append a different Array to the end of your Array.
anArray += ["Moar", "Strings"]
anArray.append(conte...
App Inventor 2 浮点数与字节转换教程 · App Inventor 2 中文网
...Interval(function() {
var msg = window.AppInventor.getWebViewString();
if (msg && msg !== "") {
try {
var data = JSON.parse(msg);
if (data.cmd === "float2bytes") {
var buf = new ArrayBuffer(4);
var view = new DataView(buf);
view.setFloat32(0, data.value, d...
iPhone : How to detect the end of slider drag?
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If you don't need any data inbetween drag, than you should simply set:
[mySlider setContinuous: NO];
This way you will receive valueChanged event only when the user stops moving the slider.
Swift 5 version:
mySlider.isCo...
Undo git update-index --skip-worktree
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If you want to undo all files that was applied skip worktree, you can use the following command:
git ls-files -v | grep -i ^S | cut -c 3- | tr '\012' '\000' | xargs -0 git update-index --no-skip-worktree
git ls-files -v w...
How do I check if an index exists on a table field in MySQL?
...me instead of Key_name, this way you don't need to find out the index name if it is automatically added without name.
– Programista
Apr 9 '14 at 11:05
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How do I Convert DateTime.now to UTC in Ruby?
If I have d = DateTime.now , how do I convert 'd' into UTC (with the appropriate date)?
7 Answers
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Microsecond timing in JavaScript
...ming data to script: the W3C High Resolution Timer, aka window.performance.now().
now() is better than the traditional Date.getTime() in two important ways:
now() is a double with submillisecond resolution that represents the number of milliseconds since the start of the page's navigation. It re...