Call a Function

How to call a function in your code.

@parent javascript/language

Type a function name in your code to call an existing function in your script.

Call a function

In the Touch Develop editor, click a line of code to open the on-screen Code Keyboard.
Click code to see the functions in your script.
Click the function that you want to call.
Click store in var to store the return value in a variable.

Example: the square function

Here's a function called square, with a Number input parameter:

/**
 * // returns the square of the input parameter x
 * @param x TODO
 */
export function square(x: number) : number {
    let result: number
    return x * x
    return result
}

The following code calls the square function, passing it an input parameter (x), and storing the return value in the result variable:

~hide

let x1 = 2

~

let result1 = square(x1)

Or this code, which displays the result of the square function (without first storing the value in a variable):

basic.showNumber(square(x1), 150)

See all your functions

To see a list of the functions in a script, open the script and then click script (in the upper-right corner). All of the functions appear under the code heading. Click on a function to open it in the editor.

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