Pair Occurence

const strng= "ABCGAG";

function getOccurence(str){
    let arr= str.split('');
    let counter=0;
    
    
    for(let i=0;i<arr.length;i++){
        console.log(arr[i]);
        if(arr[i]==='A'){
            for(let j=i+1;j<arr.length;j++){
                if(arr[j]==='G'){
                    counter++
                }
            }
        }
    }
    console.log('final countr',counter);
    
}


getOccurence(strng);