Stringify

stringify.js

// Implement JSON.stringify
var example = {
  "array": [1, 2, 3],
  "number": 123,
  "object": {
    "a": "b",
    "c": "d",
    "e": "f"
  },
  "string": "Hello World"
}


var stringify = function(obj) {
  var output = "";

  if (typeof(obj) === 'number') {
    output = output.concat(obj)
  } else if (typeof(obj) === 'string') {
    output = output.concat('"', obj, '"')
  } else if (Array.isArray(obj)) {
    output = output.concat('[', obj.map(stringify), ']')
  } else if (typeof(obj) === 'object') {
    var entries = Object.entries(obj);

    output = output.concat('{', entries.map(function(entry) {
      return "".concat('"', entry[0], '":', stringify(entry[1]))
    }), '}')
  }

  return output;
}

var output = stringify(example);

console.log(output)