Turn SI prefixes into multipliers

makeunprefixed.js

function makeUnprefixed(siUnitWithPrefix) {
	console.log(siUnitWithPrefix);

	var fullPrefixes = ['yotta', 'zeta', 'exa', 'peta', 'tera', 'giga', 'mega', 'kilo', 'hecto', 'deca', 'deci', 'centi', 'milli', 'micro', 'nano', 'pico', 'femto', 'atto', 'zepto', 'yocto']
	var prefixes     = ['Y',     'Z',    'E',   'P',    'T',    'G',    'M',    'k',    'h',     'da',   'd',    'c',     'm',     'u',     'n',    'p',    'f',     'a',    'z',     'y'];
	var factors      = [24,      21,     18,    15,     12,     9,      6,      3,      2,       1,      -1,     -2,      -3,      -6,      -9,     -12,    -15,     -18,    -21,     -24];

	siUnitWithPrefix = siUnitWithPrefix.toLowerCase();
	var multiplier = 1;

	for (var i = 0; i < fullPrefixes.length; i++) {
		if (siUnitWithPrefix.indexOf(fullPrefixes[i]) === 0) {
			multiplier = Math.pow(10, factors[i]);
			break;
		} else if (siUnitWithPrefix.indexOf(factors[i]) === 0) {
			multiplier = Math.pow(10, factors[i]);
			break;
		}
	}

	return multiplier;
}