debounce in javascript

debounce

let counter = 0; 

const getData = function() { 
    console.log('fetching data ...' + counter++); 
}; 

const debounce = function(fn, delay) { 
    let timer; 
    return function() { 
        let context = this, 
        args = arguments; 

        clearTimeout(timer); 

        timer = setTimeout(()=> { 
            fn.apply(this, arguments); 
        }, delay); 
    }
}; 

const getDataAfterPause = debounce(getData, 500);