function compose() {
	var nFuncs;
	var f;
	var i;
	nFuncs = arguments.length;
	if ( nFuncs < 2 ) {
		throw new Error( 'insufficient arguments. Must provide multiple functions to compose.' );
	}
	f = new Array( nFuncs );
	for ( i = 0; i < nFuncs; i++ ) {
		f[ i ] = arguments[ i ];
		if ( !isFunction( f[ i ] ) ) {
			throw new TypeError( format( 'invalid argument. All arguments must be functions. Value: `%s`.', f[ i ] ) );
		}
	}
	return composite;

	/**
	* Composite function.
	*
	* @private
	* @param {...*} args - arguments
	* @returns {*} result
	*/
	function composite() {
		var args;
		var i;
		args = new Array( arguments.length );
		for ( i = 0; i < args.length; i++ ) {
			args[ i ] = arguments[ i ];
		}
		args = f[ nFuncs-1 ].apply( null, args );
		for ( i = nFuncs-2; i >= 0; i-- ) {
			args = f[ i ]( args );
		}
		return args;
	}
}
Function composition.

@param {...Function} f - functions to compose
@throws {Error} must provide more than one argument
@throws {TypeError} must provide functions
@returns {Function} composite function

@example
function a( x ) {
    return 2 * x;
}

function b( x ) {
    return x + 3;
}

function c( x ) {
    return x / 5;
}

var f = compose( c, b, a );

var z = f( 6 );
// returns 3