Functions may also return value along with control, back to the caller. Such functions are called returning functions.
Syntax
function function_name():return_type {
//statements
return value;
}
- The return_type can be any valid data type.
- A returning function must end with a return statement.
- A function can return at the most one value. In other words, there can be only one return statement per function.
- The data type of the value returned must match the return type of the function.
Example
//function defined
function greet():string { //the function returns a string
return "Hello World"
}
function caller() {
var msg = greet() //function greet() invoked
console.log(msg)
}
//invoke function
caller()
- The example declares a function greet(). The function’s return type is string.
- Line function returns a string value to the caller. This is achieved by the return statement.
- The function greet() returns a string, which is stored in the variable msg. This is later displayed as output.
On compiling, it will generate following JavaScript code −
//Generated by typescript 1.8.10
//function defined
function greet() {
return "Hello World";
}
function caller() {
var msg = greet(); //function greet() invoked
console.log(msg);
}
//invoke function
caller();
The output of the above code is as follows −
Hello World
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