¡@

Home 

javascript Programming Glossary: hasownproperty

Checking if an associative array key exists in Javascript

http://stackoverflow.com/questions/1098040/checking-if-an-associative-array-key-exists-in-javascript

JavaScript post request like a form submit

http://stackoverflow.com/questions/133925/javascript-post-request-like-a-form-submit

action path for var key in params if params.hasOwnProperty key var hiddenField document.createElement input hiddenField.setAttribute.. people will be copy pasting this a lot. So I added the hasOwnProperty check to fix any inadvertent bugs. share improve this answer..

How do I check to see if an object has a property in Javascript?

http://stackoverflow.com/questions/135448/how-do-i-check-to-see-if-an-object-has-a-property-in-javascript

an object has a property in Javascript So x 'key' 1 if x.hasOwnProperty 'key' do this Is that the best way to do that javascript .. from somewhere up on the prototype chain then object.hasOwnProperty is the way to go. All modern browsers support it. It was missing.. in object will give you your desired effect. Since using hasOwnProperty is probably what you want and considering that you may want..

How can I merge properties of two JavaScript objects dynamically?

http://stackoverflow.com/questions/171251/how-can-i-merge-properties-of-two-javascript-objects-dynamically

prototypes then you have to get fancier with checks like hasOwnProperty but that code will work for 99 of cases. Example function Overwrites..

Loop through array in JavaScript

http://stackoverflow.com/questions/3010840/loop-through-array-in-javascript

for example var obj a 1 b 2 c 3 for var prop in obj if obj.hasOwnProperty prop or if Object.prototype.hasOwnProperty.call obj prop for.. in obj if obj.hasOwnProperty prop or if Object.prototype.hasOwnProperty.call obj prop for safety... alert prop prop value obj prop In.. alert prop prop value obj prop In the above example the hasOwnProperty method allows you to enumerate only own properties that's it..

Why is there a `null` value in JavaScript?

http://stackoverflow.com/questions/461966/why-is-there-a-null-value-in-javascript

if a property exists you have to use the in operator or hasOwnProperty anyway. So once again what's the practical use for seperate..

Is object empty?

http://stackoverflow.com/questions/4994201/is-object-empty

you mean has no properties of its own . Speed up calls to hasOwnProperty var hasOwnProperty Object.prototype.hasOwnProperty function.. of its own . Speed up calls to hasOwnProperty var hasOwnProperty Object.prototype.hasOwnProperty function isEmpty obj null and.. to hasOwnProperty var hasOwnProperty Object.prototype.hasOwnProperty function isEmpty obj null and undefined are empty if obj null..

How can I access local scope dynamically in javascript?

http://stackoverflow.com/questions/598878/how-can-i-access-local-scope-dynamically-in-javascript

when it was called. if typeof value undefined check if hasOwnProperty so you don't unexpected results from the objects prototype... from the objects prototype. return Object.prototype.hasOwnProperty.call prv name prv name undefined prv name value return this..

Most elegant way to clone a JavaScript object

http://stackoverflow.com/questions/728360/most-elegant-way-to-clone-a-javascript-object

need to detect unforeseen non local attributes with the hasOwnProperty method. In addition to non enumerable attributes you'll encounter.. members from that prototype which you skipped using the hasOwnProperty filter or which were in the prototype but weren't enumerable.. obj var copy obj.constructor for var attr in obj if obj.hasOwnProperty attr copy attr obj attr return copy var d1 new Date Wait for..

Comparing two arrays in Javascript

http://stackoverflow.com/questions/7837456/comparing-two-arrays-in-javascript

en US docs Web JavaScript Reference Global_Objects Object hasOwnProperty Return false if the return value is different if this.hasOwnProperty.. Return false if the return value is different if this.hasOwnProperty propName object2.hasOwnProperty propName return false Check.. value is different if this.hasOwnProperty propName object2.hasOwnProperty propName return false Check instance type else if typeof this..

How do I enumerate the properties of a javascript object?

http://stackoverflow.com/questions/85992/how-do-i-enumerate-the-properties-of-a-javascript-object

EDIT @bitwiseplatypus is correct that unless you use the hasOwnProperty method you will get properties that are inherited however I.. notwithstanding it being prototypical. Now that said hasOwnProperty is useful for filtering but we don't need to sound a warning.. object and I want all inherited properties I wouldn't use hasOwnProperty . Then let's say someone adds new properties later. Is that..