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isNaN returns true if the argument is Not a Number.

example

alert(isNaN("16-5a"));

// will show true.

parseInt is converting a text to an integer number.

example

var x = parseInt("25.8");

// used to do some basic addition with two numbers from form-fields.
// Form fields are text and thus a statement like a + b returns the concatenation : ab

parseFloat is converting a text to an floating point number.

example

var x = parseFloat("25.8");

// x contains now 25.8

// used to do some basic addition with two numbers from form-fields.
// Form fields are text and thus a statement like a + b returns the concatenation : ab