javascript - strange behavior when using Underscore when testing equals condition -

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i using underscore.js in project , came across weird behavior. when filter array changes_summary === 2 getting desired result when use same changes_summay === 0, not getting output.

following code:

var result={    "data": [      {       "id": 956,       "changes_summary": 2,       "name": "pradeep",       "age": 32      },      {       "id": 956,       "changes_summary": 0,       "name": "praveen",       "age": 22      }   ] }   var filtered = _.filter(result.data, function(obj){      return (obj.changes_summary && obj.changes_summary === 2) }); //working when comparing changes_summary 2 not working when comparing 0 console.log(filtered);

please let me know going wrong. link jsfiddle attached: jsfiddle

the first test — obj.changes_summary — fail when property value 0 because that's falsy value. if you're testing see if property present in object, can this:

return (("changes_summary" in obj) && obj.changes_summary === 0);

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