PowExample implementation using Tail Call Optimization

PowTCOExample.js

function PowTCOExample(val, exp, result = 1){
    
    //Safe case to catch all possible errors
    if(val == 0 || typeof val != 'number' 
       || typeof exp != 'number') return 0; 
    
    //First base case. Avoid recursivity when 
    //power is 0.
    if(exp === 0) return 1;
  
    //Second base case.
    if(exp === 1) return (val * result);
    
    return PowTCOExample(val, exp-1, val * result);
};