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How does the const constructor actually work?
...nst Foo(1, 3); // $Foo$int$1$int$3
var baz1 = const Baz(const Foo(1, 1), "hello"); // $Baz$Foo$int$1$int$1$String$hello
var baz2 = const Baz(const Foo(1, 1), "hello"); // $Baz$Foo$int$1$int$1$String$hello
Constants are not recreated each time. They are canonicalized at compile time and stored in ...
How to declare Return Types for Functions in TypeScript
... this.greeting = message;
}
greet() : string {
return "Hello, " + this.greeting;
}
}
var greeter = new Greeter("Hi");
var result = greeter.greet();
Here is the number example - you'll see red squiggles in the playground editor if you try this:
greet() : number {
retu...
How to use R's ellipsis feature when writing your own function?
...me, except with a default argument:
> talk <- function(func, msg=c("Hello","World!"), ...){
+ func(msg, ...);
+ }
> talk(cat,sep=":")
Hello:World!
> talk(cat,sep=",", fill=1)
Hello,
World!
>
As you can see, you can use this to pass 'extra' arguments to a function within your fu...
Specify multiple attribute selectors in CSS
...e same attribute.
Here, the selector matches all SPAN elements whose "hello" attribute
has exactly the value "Cleveland" and whose "goodbye" attribute has
exactly the value "Columbus":
span[hello="Cleveland"][goodbye="Columbus"] { color: blue; }
As a side note, using quotation marks ...
Grep for literal strings
...
cat list.txt
one:hello:world
two:2:nothello
three:3:kudos
grep --color=always -F"hello
three" list.txt
output
one:hello:world
three:3:kudos
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How do I use prepared statements in SQlite in Android?
...es
String sql = "INSERT INTO table_name (column_1, column_2) VALUES (57, 'hello')";
SQLiteStatement statement = db.compileStatement(sql);
long rowId = statement.executeInsert();
Note that the executeInsert() method is used rather than execute(). Of course, you wouldn't want to always enter the sa...
Check if a string has a certain piece of text [duplicate]
...
Here you go: ES5
var test = 'Hello World';
if( test.indexOf('World') >= 0){
// Found world
}
With ES6 best way would be to use includes function to test if the string contains the looking work.
const test = 'Hello World';
if (test.includes('World...
Split string on whitespace in Python [duplicate]
...thout an argument splits on whitespace:
>>> "many fancy word \nhello \thi".split()
['many', 'fancy', 'word', 'hello', 'hi']
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foll...
Rails - link_to helper with data-* attribute [duplicate]
...
Add a data- attribute by doing the following:
link_to "Hello", hello_path, :"data-attribute" => "yeah!"
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follow
...
Using a string variable as a variable name [duplicate]
...
You will be much happier using a dictionary instead:
my_data = {}
foo = "hello"
my_data[foo] = "goodbye"
assert my_data["hello"] == "goodbye"
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