What is the best method to convert floating point to an integer in JavaScript?

Question

There are several different methods for converting floating point numbers to Integers in JavaScript. My question is what method gives the best performance, is most compatibl

Answer 1

From "Javascript: The Good Parts" from Douglas Crockford:

Number.prototype.integer = function () {
    return Math[this < 0 ? 'ceil' : 'floor'](this);
}

Doing that your are adding a method to every Number object.

Then you can use it like that:

var x = 1.2, y = -1.2;

x.integer(); // 1
y.integer(); // -1

(-10 / 3).integer(); // -3