//if sume of 2 items inside array is 8, return true. Otherwise, return false
// array1 [1,2,3,4,9]; => false;
// array1 [1,2,6,7,9]; => true;
//Big O(n * 2);
function hasPairWithSum(arr, sum)
{
//first loop will get the first item
let arrLength = arr.length;
for(let i= 0; i < arrLength - 1; i ++)
{
for(let j= 1; j< arrLength; j++)
{
if(arr[i] + arr[j] == sum)
{
return true;
}
}
}
return false;
}
function hasPairWithSum2(arr,sum)
{
const mySet = new Set();
const len = arr.length;
for(let i = 0; i < len; i++)
{
if(mySet.has(arr[i])){
return true;
}
mySet.add(sum - arr[i]);
}
return false;
}
