efficient-comparison

// More Efficient
function compareAll(bodies) {
  // loop thru all bodies backwards : ignore first item //
  for(let i = active.length - 1; i > 0; i--) {
    // pull out bodyA for comparison //
    const bodyA = active[i];
    // loop thru all bodies backwards : start at j = i - 1 and include first item //
    for(let j = i - 1; j > -1; j--) {
      // pull out bodyB for comparison //
      const bodyB = active[j];
      
      // ompare bodyA to bodyB...
    }
  }
}