Handlebars {{#if (op ... )}} operators

handlebars-operators.md

 Based on https://stackoverflow.com/a/31632215/761771

const reduceOp = function(args, reducer){
  args = Array.from(args);
  args.pop(); // => options
  var first = args.shift();
  return args.reduce(reducer, first);
};

handlebars.registerHelper({
  eq  : function(){ return reduceOp(arguments, (a,b) => a === b); },
  ne  : function(){ return reduceOp(arguments, (a,b) => a !== b); },
  lt  : function(){ return reduceOp(arguments, (a,b) => a  <  b); },
  gt  : function(){ return reduceOp(arguments, (a,b) => a  >  b); },
  lte : function(){ return reduceOp(arguments, (a,b) => a  <= b); },
  gte : function(){ return reduceOp(arguments, (a,b) => a  >= b); },
  and : function(){ return reduceOp(arguments, (a,b) => a  && b); },
  or  : function(){ return reduceOp(arguments, (a,b) => a  || b); },
}); 

Example

{{#if (or 
        (eq section1 "foo")
        (ne section2 "bar"))}}
.. content
{{/if}}

{{#if (or condA condB condC)}}
.. content
{{/if}}

Thank you.