Tiny function and operator curriers

curry.js

function curry(func, arity) {
    arity = (arity === undefined) ? func.length : arity;
    if (arity > 1) {
        return function (arg) {
            var args = Array.prototype.slice.call(arguments, 0);
            return function partial (arg) {
                args = args.concat(Array.prototype.slice.call(arguments, 0));
                if (args.length < arity) {
                    return partial;
                } else {
                    return func.apply(this, args);
                }
            };
        };
    } else {
        return func;
    }
}

function operatorFunction(isLeftArg, operator, isRightArg) {
    var parts = [];
    if (isLeftArg) {
        parts.push('leftArg');
    }
    if (isRightArg) {
        parts.push('rightArg');
    }
    parts.push('return (' + (isLeftArg ? 'leftArg ' : '') + operator + (isRightArg ? ' rightArg' : '') + ');');
    return Function.apply(Object.create(Function.prototype), parts);
}

function curryOperator(isLeftArg, operator, isRightArg) {
    return curry(curryOperator(isLeftArg, operator, isRightArg), isLeftArg + isRightArg);
}