Rebuilding simple version of _.get()

get.js

  function get(base, pathQuery, returnOnUndefinedValue) {
    var pathArr = pathQuery.split('.');
    var currentVal = base;
    for (var i=0; i<pathArr.length; i++) {
      var key = pathArr[i];
      currentVal = currentVal[key];
      if (!currentVal) {
        return returnOnUndefinedValue ;
      }
    }
    return currentVal;
  }

getLastValidPath.js

// FIXME: check for window vs global myself?
// and make that the base?
// logs the part of the path that's valid... great for finding where the path goes bad...
function findValidPath(pathQuery) {


  var pathArr = pathQuery.split('.')
  var lastValidPath = eval(pathArr[0]) // TOOD: consider using window / global as base here instead of using eval...

  // start at 1 bc we already have 0
  for (var i = 1; i < pathArr.length; i++) {
    var key = pathArr[i]
    var nextPath = lastValidPath[key]

    console.log('key', key)
    console.log("lastValidPath", lastValidPath)
    console.log('nextPath', nextPath)

    if (!nextPath) {
      // return path and value
      console.log('i', i)
      return {
        validPath: pathArr.slice(0, i).join("."),
        value: lastValidPath
      }
    } else {
      lastValidPath = nextPath
    }
  }

  // Whole path, bc whole path is valid...

  return {
    validPath: pathArr.slice(0, i).join("."),
    value: lastValidPath
  }


}



// test cases
var test1 = {
  a: {
    b: 'valid'
  }
}
console.log("TEST CASE 1", findValidPath('test1.a.b')) // whole path is valid
console.log("TEST CASE 2", findValidPath('test1.a.a')) // partially valid path