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How do I write a custom init for a UIView subclass in Swift?
Say I want to init a UIView subclass with a String and an Int .
5 Answers
5
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Fastest method to replace all instances of a character in a string [duplicate]
...nces of foo with bar in the string str. If you just have a string, you can convert it to a RegExp object like this:
var pattern = "foobar",
re = new RegExp(pattern, "g");
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What is the use of the square brackets [] in sql statements?
...as SQL keywords, or have spaces in them.
Example:
create table test ( id int, user varchar(20) )
Oh no! Incorrect syntax near the keyword 'user'.
But this:
create table test ( id int, [user] varchar(20) )
Works fine.
...
Understanding what 'type' keyword does in Scala
...e alias FunctorType is just a shorthand for
(LocalDate, HolidayCalendar, Int, Boolean) => LocalDate
Type aliases are often used to keep the rest of the code simple: you can now write
def doSomeThing(f: FunctorType)
which will be interpreted by the compiler as
def doSomeThing(f: (LocalDate,...
How To Save Canvas As An Image With canvas.toDataURL()?
... create a dummy HTML anchor, and download the image from there like...
// Convert canvas to image
document.getElementById('btn-download').addEventListener("click", function(e) {
var canvas = document.querySelector('#my-canvas');
var dataURL = canvas.toDataURL("image/jpeg", 1.0);
downl...
Get list from pandas DataFrame column headers
...pears, again
cols
# ['A', 'B', 'C']
... if you're the kind of person who converts coffee to typing sounds, well, this is going consume your coffee more efficiently ;)
P.S.: if performance is important, you will want to ditch the
solutions above in favour of
df.columns.to_numpy().tolist()
# ...
Use of “instanceof” in Java [duplicate]
...you have a reference or parameter to an object that is of a super class or interface type and need to know whether the actual object has some other type (normally more concrete).
Example:
public void doSomething(Number param) {
if( param instanceof Double) {
System.out.println("param is a Do...
Concatenate text files with Windows command line, dropping leading lines
...
more seemingly convert tab into spaces, pity!
– Antonio
Aug 18 '15 at 8:13
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How to declare a local variable in Razor?
...nd ends, but it's not perfect. Sometimes we just have to give it a little hint regarding what should be treated as Razor/C#, and what shouldn't. If you ever get a Razor error, adding { } tags is usually the first step
– Jon Story
Oct 8 '15 at 10:16
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What is a 'semantic predicate' in ANTLR?
...
grammar (Numbers.g) would do such a thing:
grammar Numbers;
// entry point of this parser: it parses an input string consisting of at least
// one number, optionally followed by zero or more comma's and numbers
parse
: number (',' number)* EOF
;
// matches a number that is between 1 and 3...