method-chain.js

const dog = function(valor){
    let iterator = 0;
    const log = () => iterator++; 
    this.total = () => console.log(iterator);
    this.bite = (dish) => {
        console.log(`Om-Nom-nom ${dish}`);
        log();       
        return this;
    }
    this.woof = function(command){
        console.log(`${command}`);
        log();       
        return this;
    }   
    return this;
};
dog().woof('aggrr..').woof('woof').bite('ahm')