JavaScript: Maths tutorial code snippet 3.

Working with strings: conversion using 'parseFloat()', 'parseInt()' and 'Number()'.

Examples of use of above with strings: '42.50', '42.50text' and 'text'.

Introducing 'typeof()' which returns the type of data that has been passed to it. Using 'isNaN()' on the data type.

Experiment with using 'minus 0' technique on a string to convert to a number.