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Why is isNaN(null) == false in JS?
...pts to convert the passed parameter to a number1 (equivalent to Number(x)) and then tests if the value is NaN. If the parameter can't be converted to a number, Number(x) will return NaN2. Therefore, if the conversion of parameter x to a number results in NaN, it returns true; otherwise, it returns f...
String concatenation vs. string substitution in Python
In Python, the where and when of using string concatenation versus string substitution eludes me. As the string concatenation has seen large boosts in performance, is this (becoming more) a stylistic decision rather than a practical one?
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How to convert String to Long in Kotlin?
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1. string.toLong()
Parses the string as a [Long] number and returns the result.
@throws NumberFormatException if the string is not a valid
representation of a number.
2. string.toLongOrNull()
Parses the string as a [Long] number and returns the result or null
if the...
How to compare arrays in C#? [duplicate]
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Great answer, and I know it's a little late, but that could be simplified to this: bool isEqual = target1.SequenceEqual(target2);
– Connie Hilarides
Mar 16 '14 at 7:57
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How to wait for the 'end' of 'resize' event and only then perform an action?
...+ operation. rtime: Date; .... if (+new Date() - +rtime < delta) and in typescript resizeend function should be arrow function like this resizeend=()=>. Because in resizeend function, this reference to window object.
– Muhammet Can TONBUL
Feb 19 at...
Is it possible to solve the “A generic array of T is created for a varargs parameter” compiler warni
...uestion, one generic class uses another class with generic type parameters and needs to pass one of the generic types to a method with varargs parameters:
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Java synchronized method lock on object, or method?
...s, you have synchronize on them separately in synchronized () blocks. If a and b were object references you would use:
public void addA() {
synchronized( a ) {
a++;
}
}
public void addB() {
synchronized( b ) {
b++;
}
}
But since they're primitives you can't do thi...
Remove a file from a Git repository without deleting it from the local filesystem
...ial commit contained some log files. I've added *log to my .gitignore , and now I want to remove the log files from my repository.
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How to hide UINavigationBar 1px bottom line
...navigationBar?.scrollEdgeAppearance = navigationBarAppearence
For iOS 12 and below:
To do this, you should set a custom shadow image. But for the shadow image to be shown you also need to set a custom background image, quote from Apple's documentation:
For a custom shadow image to be shown, a...
Installed Java 7 on Mac OS X but Terminal is still using version 6
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Because you need to enter in Java Preferences pane and flag only the JVM 7 in this way :
To easily and quickly open the Java Preferences pane in Mac OS X you can simply call spotlight with ⌘+SPACE and type System Preferences it will show up in the last row of the window.
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