all sorts of ways of checking two values against each other

multicompare.js

/*use the type of a test value to compare two values in different ways*/
var multicompare = _.curry(function(test,what){
  var splittest;
  if(typeof test === "string"){
    if(test.indexOf('this.')===0){
      what = this;
      test = test.replace('this.','');
    }
    if(test.indexOf('.{')>0){
      console.log('object string');
      splittest = test.split('.{');
      what = _.get(what,splittest[0]);
      try{
        test = JSON.parse("{"+splittest[1]);
      }catch(e){
        test = null;
      }
    }
  }
  return !_.isError(what) && (
    ((typeof test === "number" || typeof test==="boolean") && test===what) ||
    (_.isPlainObject(test) && _.matches(test)(what)) ||
    (typeof test === "string" && !!_.get(what,test)) ||
    (typeof test === "function" && test(what))
  );
});

// if what is type Error, fail
// if test is type number or boolean, exact equality comparison
// if test is a plain object, use lodash's matches to compare to what
// if test is function that returns true or false, run it with what as the argument
// if test is a string, treat it as a tokenized path and return true if the value 
//   at that path exists and is truthy
//   Also for string tests, consider any strings that start with "this." 
//   to refer to the contextual this ignoring "what"
//   Also for string tests, allow a a string like "path.path.{prop:value}", 
//   which looks into the path before '{"prop":value}'', parses that object 
//   syntax into a real object, 
//   and passes it to _.matches