kata: make the deadfish swim

instructions.md

Write a simple parser that will parse and run Deadfish.

Deadfish has 4 commands, each 1 character long:

i increments the value (initially 0) d decrements the value s squares the value o outputs the value into the return array Invalid characters should be ignored.

parse("iiisdoso") => [ 8, 64 ]

my_solution.js

function parse( data )
{

var response = [];
var num = 0;

data.split("").forEach(function(val) {

if (val == "d") {
  num--;
} else if (val == "i") {
  num ++;
} else if (val == "s") {
  num = num*num;
} else if (val == "o") {
  response.push(num);
}
    
});

return response;
  
}

other_solutions.js

//SOLUTION ONE
function parse(data) {
  let res = [];

  data.split('').reduce((cur, s) => {
    if (s === 'i') cur++;
    if (s === 'd') cur--;
    if (s === 's') cur = Math.pow(cur, 2); //I would've done cur *= cur;
    if (s === 'o') res.push(cur);
    
    return cur;
  }, 0);
  
  return res;
}

//SOLUTION TWO

function parse( data ) {  
  var v = 0, ret = []
  for (var c of data) {
    switch (c) {
      case 'i' : v++;         break;
      case 'd' : v--;         break;
      case 's' : v=v*v;       break;
      case 'o' : ret.push(v); break;
    }
  }
  return ret;
}