JS TutorialLesson 18Free preview

JS Objects

This lesson is part of JavaScript · All levels

Summary

An object is a data structure that stores a pair of property values in a single variable, so that the related data can be grouped. The property is accessible via a dot notation (obj.property) or bracket notation (obj['property']), and a property may also contain a function called a method. The object is mutable, meaning that the value in it can be added, changed, or deleted at any time.

Key points

Object is made with curly braces: const obj = {key: value}
Dot notation for static names, bracket notation for dynamic or special names
Method is a function-shaped property called a point sign
Property that has not yet been generated, not error

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