const _ = {};

_.compose = (...fns) => {
    let result = null;
    return (...args) => {
        result = args;
        for(let i = fns.length - 1; i >= 0; i--) {    
            let fnResult = fns[i](...result);
            result = Array.isArray(fnResult) ? fnResult : [fnResult];            
        }
        return result;
    };
};

const consider = name => `I think it could be... ${name}`;
const exclaim = statement => `${statement.toUpperCase()}!`;
const blame = _.compose(consider, exclaim);
const result = blame('you');
console.log(result);