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Not quite understand what does the i stand for in forEach function in my code

I am using this method to find the frequency of words, however i am a bit confused with the whole code.

Here is the code:

function check(){
 var word = document.querySelector('textarea').value.split(" ");
   frequency ={};
   word.forEach(function(i){
      console.log(i)
      if(!frequency[i]){
         frequency[i] = 0;
      }
      frequency[i]+=1
   })
console.log(frequency)
}

<textarea></textarea>
<button onclick = 'check()'>check</button>

I just wonder what does the i stand for and what does the frequency[i].

Could someone explain to me a little bit because I think this code is not quite friendly for me, the beginner.

7 months ago · Juan Pablo Isaza

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Accepted Answer · 2022-07-10T06:22:24.381Z

foreach iterates over array, and as paramter has function into which is passed as parameter actual element of array. So i in this function is actual element of 'word' array.

for object frequency is frequency[i] the i'th element. At start, this object is empty, so frequency[i] will be undefined, but in foreach loop you filling this object with some values so in next iterations there may by some values