I have a clear function that accepts an array, string, or no arguments. If no arguments, it should clear the entire data object. It works fine, but looking for a code review.The possibilities should be:clear('one');clear(); //clear allclear(['one', 'three']);var data = {  one: 'test1',  two: 'test2',  three: 'test3'};var clear = function(fields) {  if (fields !== undefined) {    if (typeof fields === 'string') {      data[fields] = '';    } else {      _.each(fields, function(field) {        if(data.hasOwnProperty(field)) {          data[field] = '';        }      });    }  } else {    // clear all    _.each(data, function(value, key) {      data[key] = '';    });  }};clear(['one', 'two']);clear();clear(['one']);<script src=https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore-min.js></script>
Simplify simple object clear function with Javascript
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