Function diff

tests/qunit.js:822–834

( a, b )

// returns a new Array with the elements that are in a but not in b
function diff( a, b ) {
	var result = a.slice();
	for ( var i = 0; i < result.length; i++ ) {
		for ( var j = 0; j < b.length; j++ ) {
			if ( result[i] === b[j] ) {
				result.splice(i, 1);
				i--;
				break;
			}
		}
	}
	return result;
}

function fail(message, exception, callback) {
	if ( typeof console !== "undefined" && console.error && console.warn ) {