define a callback parameter ts code example
Example 1: typescript parameter function type
class Foo {
save(callback: (n: number) => any) : void {
callback(42);
}
}
var foo = new Foo();
var strCallback = (result: string) : void => {
alert(result);
}
var numCallback = (result: number) : void => {
alert(result.toString());
}
foo.save(strCallback);
foo.save(numCallback);
Example 2: typescript function
function add(x: number, y: number): number {
return x + y;
}
let myAdd = function (x: number, y: number): number {
return x + y;
};