eloquentjavascript : chapter 3

file.js

// minimum

function min(arg1, arg2) {
  return (arg1 < arg2) ? arg1 : arg2;
}

console.log(min(0, 10));
console.log(min(0, -10));

// recursion

function isEven(n) {
  if(n < 0) throw "Must be a whole positive number";
  if(n <= 1) return (n === 0) ? true : false;
  return isEven(n-2);
}
console.log(isEven(50));
console.log(isEven(75));
console.log(isEven(-1));

// bean counting

function countBs(s) {
  var out = 0;
  for(var i=0; i < s.length; i++) {
    if(s[i] === 'B') out++;
  }
  return out;
}

function countChar(s, char) {
  var out = 0;
  for(var i=0; i < s.length; i++) {
    if(s[i] === char) out++;
  }
  return out;
}

console.log(countBs("BBC"));
console.log(countChar("kakkerlak", "k"));

output

// minimum
0
-10

// recursion
true
false
Must be a whole positive number

// bean counting
2
4