Handlebar.js generic lodash helper

lodash_helper.js

Handlebars.registerHelper("_", function() {
  var options = [].pop.call(arguments);
  var func = [].shift.call(arguments);
  return _[func].apply(_, arguments);
});


// Usage: 
{{_ 'functionName' arg1 arg2 argn}}
// Example - _.round() → 4.01 
{{_ 'round' 4.006, 2}}

What is

var options = [].pop.call(arguments);

that line doing? It appears options is unused 🤔

@JimiHFord

Handlebars adds an options object as the last parameter when it calls the handler. This line cherry picks that object off so that it's no longer part of arguments when it's passed to the lodash method. Same thing with this line:

var func = [].shift.call(arguments);

It removes the first parameter so that all that is passed to the lodash method is the data/object that you want to operate on.