Learn JavaScript: Objects
Expand your programming knowledge with objects!
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Key Concepts
Review core concepts you need to learn to master this subject
Restrictions in Naming Properties
Dot Notation for Accessing Object Properties
Objects
Accessing non-existent JavaScript properties
JavaScript Objects are Mutable
JavaScript for...in loop
Properties and values of a JavaScript object
Delete operator
Restrictions in Naming Properties
Restrictions in Naming Properties
// Example of invalid key names
const trainSchedule = {
platform num: 10, // Invalid because of the space between words.
40 - 10 + 2: 30, // Expressions cannot be keys.
+compartment: 'C' // The use of a + sign is invalid unless it is enclosed in quotations.
}JavaScript object key names must adhere to some restrictions to be valid. Key names must either be strings or valid identifier or variable names (i.e. special characters such as - are not allowed in key names that are not strings).
Objects
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Learn JavaScript: Objects
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