SOURCE

const debounce =(fn,delay)=>{
    let timer = null 
   
    return function(){
        if(timer) clearTimeout(timer)
        timer = setTimeout(()=>{
            fn.call(this,...arguments)
        },delay)

       return [].slice.call(arguments)
    }
}

const fun =(a)=>{
    console.log(a)
}

const db = debounce(fun,1000)

console.log(db(11),11)

console.log(db(22),22)

console.log(db(33),33)



const throttle =(fn,delay)=>{
    let timer = null 
   
    return function(){
        if(!timer){
            timer = setTimeout(()=>{
            fn.call(this,...arguments)
            clearTimeout(timer)
          },delay)
        }
        
    }
}


const tt = throttle(fun,1000)

console.log(tt(11),11)

console.log(tt(22),22)

console.log(tt(33),33)