Returns true if an object has an own, enumerable property. Nested properties can be checked using using dot notation paths ('a.b.c').

Universal and better typed `hasOwnProperty` for IntelliSense. Supports checking: properties of all types; multiple keys at a time; and type of values.

Test if an object has a specified method name, either own or inherited.

Used to determine whether an object has an own property with the specified property key.

Test if an object has a specified property, either own or inherited.

Test if an object has a specified method name.

Test if an object has a specified property.

Function updateRecords keeps updated your musical album collection represented by a JSON object. Each album has a unique id number as its key and several other properties like artist or tracks.

Object Oriented Programming module of JavaScript Algorithm and Data Structures freeCodeCamp Certification

FCC exercise to learn functions. lookUpProfile() function takes a name and a property (_prop_) as arguments and checks if name is an actual contact's firstName and the given property (prop) is a property of that contact.

Basic Data Structures module of JavaScript Algorithm and Data Structures freeCodeCamp Certification

Showing a dictonary object and how to destroy and repair its "hasOwnProperty" method

[Node.js] Retrieves a property only if hasOwnProperty() is true.