if (someVar.hasOwnProperty('someProperty') ) {  // do something(); } else {  // do somethingElse(); }   What is the right use/explanation of hasOwnProperty('someProperty')?  Why we can't simply use someVar.someProperty to check...
I am using a recursive function based around for(.. in ..) and hasOwnProperty to clone objects, which works fine in IE and FF... but not Chrome.    When iterating over members of an object using for(... in ...) Firefox and Chrome gives different resu...
I want to use an ES6 proxy to trap the following common code:  for (let key in trapped) {     if (!Object.prototype.hasOwnProperty.call(obj, key)) continue;     let value = trapped[key];     //various code }   But after reviewing the proxy documentat...
It seems to me that there are four different ways I can determine whether a given object (e.g. foo) has a given property (e.g. bar) defined:   if (foo.hasOwnProperty(bar)) { if ('bar' in foo) { if (typeof foo.bar !== 'undefined') { if...
I want to check if an input element is a checkbox or text type.  I know I can do this:  //Type of input.. if ( input.type === "checkbox" )  //Contains the property.. if ( "checked" in input )    But my question is: why do hasOwnProper...
Maybe this is a newbie question, but I cannot find or think out the explanation. Start the Node.js console.  > global.hasOwnProperty === hasOwnProperty true   Then why  > global.hasOwnProperty("x") false   but  > hasOwnProperty("...
I am trying to use hasOwnProperty in a more elegant way.  I have this code here, which works fine:  var obj = {     a: 2,     b: 7,     bamboo: 22 };  var keys = Object.keys(obj).filter(key => obj.hasOwnProperty(key));  // keys: [ "a", ...
I've browsed the jquery source, but I am still unsure. Does jQuery.each check for hasOwnProperty or does it not?  if I loop over an object with for..in, I need to check. I allways thought I don't need to check when using jquery.....
hasOwnProperty seems to behave differently depending on whether it is called on a constructor function or an instance, depending on the use of this or let for the contained members.  function Animal(_name) {      let name = _name;      this.getName =...
I'm using angular-1.2.1.js on ie8 and getting the error:  Object doesn't support property or method 'hasOwnProperty' (inside the angular ForEach method)  function forEach(obj, iterator, context) {   var key;   if (obj) {     if (isFun...

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