In the array, there are a few pairs of each of the two values added equal to 8

var arr = [0,1,2,3,4,5,6,7,0,8];

function Addfun (Myarr) {
var count = 0;
for (var i=0; i<myarr.length; i++) {
for (var j=i+1; j<myarr.length; J + +) {
if (myarr[i]+myarr[j]==8) {
Count+=1;
}
}
}
return count;
}

Console.log (Addfun (arr));

Idea: If the current is the first value, let the first value be added to each subsequent value one at a time. If there is equal to 8, count is plus 1.

In the array, there are a few pairs of each of the two values added equal to 8