JavaScript comparison function by operator

comparison_function_by_operator.js

var comparisonFunctionByOperator = (function ()
{
  var hash = {
              "<"  : (left, right) => left <   right,
              "<=" : (left, right) => left <=  right,
              ">"  : (left, right) => left >   right,
              ">=" : (left, right) => left >=  right,
              "===": (left, right) => left === right,
              "!==": (left, right) => left !== right,
              "==" : (left, right) => left ==  right,
              "!=" : (left, right) => left !=  right
            };
  return function (comparisonOperator)
  {
    var fun = hash[comparisonOperator];
    if (!fun)
      throw new Error("Invalid comparisonOperator: " + comparisonOperator);
    return fun;
  }
})();