You can’t convert an integer directly to a Character instance, but you can go from integer to UnicodeScalar to Character and back again: let startingValue = Int((“A” as UnicodeScalar).value) // 65 for i in 0 ..< 26 { print(Character(UnicodeScalar(i + startingValue))) }
It’s declared inside a closure, which means it can only be accessed there. If you want a variable accessible globally, you can remove the var: $(function(){ value = “10”; }); value; // “10” This is equivalent to writing window.value = “10”;.
For PHP >= 7.0: As of PHP 7 you can use the null-coalesce operator: $user = $_GET[‘user’] ?? ‘guest’; Or in your usage: <?= $myVar ?? ” ?> For PHP >= 5.x: My recommendation would be to create a issetor function: function issetor(&$var, $default = null) { return isset($var) ? $var : $default; } This … Read more
There is none. Alas, you have to type out the full type name. Edit: 7 years after being posted, type inference for local variables (with var) was added in Java 10. Edit: 6 years after being posted, to collect some of the comments from below: The reason C# has the var keyword is because it’s … Read more
Declarations of var variables get hoisted – the variable name initialization gets hoisted to the top of the containing function (or, if no function, to the top of the outer block). So var withVar = (function() {throw ‘error!’})() is parsed by the interpreter as var withVar; withVar = (function() {throw ‘error!’})() The same is not … Read more
Scoping rules The main difference is scoping rules. Variables declared by var keyword are scoped to the immediate function body (hence the function scope) while let variables are scoped to the immediate enclosing block denoted by { } (hence the block scope). function run() { var foo = “Foo”; let bar = “Bar”; console.log(foo, bar); … Read more
What ReSharper suggests is clearly overuse of the var keyword. You can use it where the type is obvious: var obj = new SomeObject(); If the type is not obvious, you should rather write it out: SomeObject obj = DB.SomeClass.GetObject(42);
Try This… <html> <head> <script> function myFunction() { var number = “123”; document.getElementById(“myText”).innerHTML = number; } </script> </head> <body onload=”myFunction()”> <h1>”The value for number is: ” <span id=”myText”></span></h1> </body> </html>
With var you have a function scope, and only one shared binding for all of your loop iterations – i.e. the i in every setTimeout callback means the same variable that finally is equal to 6 after the loop iteration ends. With let you have a block scope and when used in the for loop … Read more
Yes, a Var in Clojure is similar to a C pointer. This is poorly documented. Suppose you create a function fred as follows: (defn fred [x] (+ x 1)) There are actually 3 things here. Firstly, fred is a symbol. There is a difference between a symbol fred (no quotes) and the keyword :fred (marked … Read more