Resolving dot separated key fields in nested Javascript objects.

resolveKeyString.js

function resolveKeyString(obj, keyString) {
  return keyString.split('.').reduce(function(p, c) {
    return p[c];
  }, t);
}

// Usage:
var obj = {
  a: {
    b: {
      c: 'value'
    }
  }
};

var keyString = 'a.b.c';

console.log(resolveKeyString(obj, keyString));

// => 'value'