Using `hasOwnProperty` vs !!<someObj>.<someProperty>
Jan 11, 2023 · Using `hasOwnProperty` vs !!<someObj>.<someProperty> In a recent PR I made, I needed to render a component only if a certain property existed on a model. To do this I used …
Any difference between Object.prototype.hasOwnProperty.call …
Sep 6, 2011 · Any difference between Object.prototype.hasOwnProperty.call (someObj, key) and someobj.hasOwnProperty (key)? I was going through the annotated source of underscore.js and …
Why is hasOwnProperty ('nodeValue') false when nodeValue is 'text'?
Jan 26, 2022 · Nope, .hasOwnProperty () returns true only if the property is assigned directly on the object you are checking, if it is on any of its prototypes - it will return false (everythings prototype …
What is the recommended for iterating objects? : r/javascript
Feb 10, 2017 · For POJOs you're generally okay to use it, but as soon as you start using new or Object.create around it, you need that hasOwnProperty check as you've shown. This just seems …
The Difference Between in and hasOwnProperty in JavaScript
May 10, 2019 · hasOwnProperty does work for getters (which existed in ES5, btw). In the example here, it only tests a class-defined getter which is defined in the prototype which in turn means it will get …
Why did the author used used .call () to invoke hasOwnProperty
Nov 16, 2015 · And since hasOwnProperty is an Object method, it's literally going to find it the last place it looks. All those pointer hops between property references are fast, but add up quickly. Looking up …
Is there a better way to check for nested object properties?
Nov 22, 2018 · Hi, Is there a better/prettier way of checking for nested object properties than this? if ( obj.hasOwnProperty ('prop1') &&…
How do find the source of "Cannot read property 'hasOwnProperty' of ...
Apr 19, 2021 · Looks like that script has been a frequent source of joy. Google "gtm.js Cannot read property 'hasOwnProperty' of undefined" for hours of reading fun.
hasOwnProperty in JavaScript : r/codehunter - Reddit
Apr 19, 2022 · I expected shape1.hasOwnProperty (name) to return true, but it's returning false.
Javascript problems : r/twinegames - Reddit
Jan 8, 2022 · What's going on In SugarCube, each JavaScript instance is its own strict environment. If you want to be use a function you define in one instance within another, you'll need to make it a) live …