Convert a String to a Number!.js

// Note: This kata is inspired by Convert a Number to a String!. Try that one too.

// Description
// We need a function that can transform a string into a number. What ways of achieving this do you know?

// Note: Don't worry, all inputs will be strings, and every string is a perfectly valid representation of an integral number.

// Examples
// stringToNumber("1234") == 1234
// stringToNumber("605" ) == 605
// stringToNumber("1405") == 1405
// stringToNumber("-7"  ) == -7

///////////// Solution //////////////

var stringToNumber = function(str){
    // put your code here
    return Number(str);
  }