deepassign.js

// given a keyPath as a string assign the value
// to the given keyPath

function deepAssignment(obj, keyPath, value) {
  //obj[keyPath] = value; //if only...
  var path2 = keyPath.split("");
  var path3 = path2.map(function(char, index){ 
    if (char === "[") return isNaN(Number(path2[index+1])) ? "." : "~`~.";
    else if (char === "]" || char === "'" || char === '"') return ""; //try splicing
    else return char;
  });
  //can be made more efficient
  var path4 = path3.join("");
  var path5 = path4.split(".");
  console.log(path5);
  //^^^^^
  var final = "";
  path5.forEach(function(piece, index){ 
    makeArr = piece.slice(piece.length-3,piece.length) === '~`~';
    console.log("---making an array this time?: " + makeArr)
    console.log("piece: " + piece)
    if (makeArr) final += ("['" + piece.slice(0,piece.length-3) + "']");
    else final += ("['" + piece + "']")
    console.log(final);
    console.log("make new:", eval("obj" + final) === undefined, eval("obj" + final));
    if (index !== path5.length-1) {
      if (eval("obj" + final) === undefined) {
        console.log("making new:")
        console.log("obj" + final + (makeArr ? " = []" : " = {}"))
        if (makeArr) {console.log("SET ARRAY");eval("obj" + final + "= []");console.log("fail??");}
        else eval("obj" + final + "= {}");
      }
    }
    else {
      console.log("inside else")
      console.log("obj" + final + "= value")
      eval("obj" + final + "= value");
    }
    console.log("Current: ", eval("obj"+final), "final:", final)
  })
  console.log(obj);
}