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Append class if condition is true in Haml
...ay that this works is that the conditional gets evaluated and if true, the string gets included in the classes, if not it won't be included.
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Difference between File.separator and slash in paths
... difference between using File.separator and a normal / in a Java Path-String?
14 Answers
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Truncate number to two decimal places without rounding
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Convert the number into a string, match the number up to the second decimal place:
function calc(theform) {
var num = theform.original.value, rounded = theform.rounded
var with2Decimals = num.toString().match(/^-?\d+(?:\.\d{0,2})?/)[0]
...
Firebase Storage How to store and Retrieve images [closed]
...s, you'll want to get the base64-encoded contents so you can store it as a string. Or even more convenient, you can store it as a data: url which is then ready to plop in as the src of an img tag (this is what the example does)!
2. For larger images
Firebase does have a 10mb (of utf8-encoded stri...
Javascript: formatting a rounded number to N decimals
...s the same as 2.0000000000000. It's when you turn the rounded value into a string that you have make it display a certain number of digits.
You could just add zeroes after the number, something like:
var s = number.toString();
if (s.indexOf('.') == -1) s += '.';
while (s.length < s.indexOf('.')...
How can I convert string to datetime with format specification in JavaScript?
How can I convert a string to a date time object in javascript by specifying a format string?
15 Answers
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Java Immutable Collections
...may point to the same data through which it can be changed.
e.g.
List<String> strings = new ArrayList<String>();
List<String> unmodifiable = Collections.unmodifiableList(strings);
unmodifiable.add("New string"); // will fail at runtime
strings.add("Aha!"); // will succeed
System....
Two-way encryption: I need to store passwords that can be retrieved
...verification of source data
*
*/
class Encryption {
/**
* @var string $cipher The mcrypt cipher to use for this instance
*/
protected $cipher = '';
/**
* @var int $mode The mcrypt cipher mode to use
*/
protected $mode = '';
/**
* @var int $rounds The...
How to check if a file exists in the Documents directory in Swift?
...thForDirectoriesInDomains(.documentDirectory, .userDomainMask, true)[0] as String
let url = NSURL(fileURLWithPath: path)
if let pathComponent = url.appendingPathComponent("nameOfFileHere") {
let filePath = pathComponent.path
let fileManager = FileManager.default
if fi...
How do I run Asynchronous callbacks in Playground
...of NSURLConnection):
import UIKit
import PlaygroundSupport
let url = URL(string: "http://stackoverflow.com")!
URLSession.shared.dataTask(with: url) { data, response, error in
guard let data = data, error == nil else {
print(error ?? "Unknown error")
return
}
let conte...