using google sheet functions inside google script

Question

I made this google script:

    function quadrato(input) {
      return POW(input,2);
    }

I entered a call to my "quadrato" function in a sheet, but the sheet gave me this error:

ReferenceError: "POW" non definito. (riga 2).

sheet calling my script function "quadrato"

Instead "POW" is a referenceable function from sheets, as you can see in this iimage:

Answer 1

Actually, you just need to declare your custom function:

Add /** ... */ statement in front of the function(){}

/**
 * Your description about this function.
 * @customfunction
 * @param {input} the description about this papameter
 */
function quadrato(input) {
  return Math.pow(input,2);
}