comp.ts

interface func {
	(arg: any): any;
}

function compose(...funcs: func[]): func {
	if (funcs.length === 1) {
		return (arg: any) => funcs.shift()(arg);
	} else if (funcs.length > 1) {
		return (arg: any) => funcs.reduceRight((prev, item) => item(prev), arg);
	} else {
		return null;
	}
}