functions.ts

export namespace asdfasdfasdfasdflkjasdflkjasdflkjasdflkjasdf {
}

namespace parameter {
    // variable annotation
    var sampleVariable: { bar: number }

    // function parameter
    function foo(sampleParameter: { bar: number }) { }
}

namespace returnType {
    interface Foo {
        foo: string;
    }

    // Return type annotated as `: Foo`
    function foo(sample: Foo) {
        return sample;
    }
}

namespace inferred {
    interface Foo {
        foo: string;
    }

    function foo(sample: Foo) {
        return sample; // inferred return type 'Foo'
    }
}

namespace misspelled {
    function foo() {
        return { fou: 'John Doe' }; // You might not find this misspelling `foo` till its too late
    }

    sendAsJSON(foo());
}

namespace optional {
    function foo(bar: number, bas?: string): void {
        // ..
    }

    foo(123);
    foo(123, 'hello');
}

namespace optionalDefault {
    function foo(bar: number, bas: string = 'world') {
        console.log(bar, bas);
    }

    foo(123);           // 123, world
    foo(123, 'hello');  // 123, hello
}

namespace overloads {
    export function padding(a: number, b?: number, c?: number, d?: any) {
        if (b === undefined && c === undefined && d === undefined) {
            b = c = d = a;
        }
        else if (c === undefined && d === undefined) {
            c = a;
            d = b;
        }
        return {
            top: a,
            right: b,
            bottom: c,
            left: d
        };
    }
}

namespace overloadsDone {
    export function padding(all: number);
    export function padding(topAndBottom: number, leftAndRight: number);
    export function padding(top: number, right: number, bottom: number, left: number);
    export function padding(a: number, b?: number, c?: number, d?: number) {
        if (b === undefined && c === undefined && d === undefined) {
            b = c = d = a;
        }
        else if (c === undefined && d === undefined) {
            c = a;
            d = b;
        }
        return {
            top: a,
            right: b,
            bottom: c,
            left: d
        };
    }
}