Mark As Completed Discussion
Home > Frontend Engineering and Javascript > Javascript Fundamentals > Objects and Key-Value Stores

Properties of Dictionaries

  • Objects cannot have duplicate keys. That is, two keys of the same name in the same object will generate an error.
  • Values assigned to keys in an object can be of any data type (as shown in the examples in the previous section).
  • JavaScript only allows strings to be the keys in an object. No other data type is allowed.

Programming Categories

  • Basic Arrays Interview Questions
  • Binary Search Trees Interview Questions
  • Dynamic Programming Interview Questions
  • Easy Strings Interview Questions
  • Frontend Interview Questions
  • Graphs Interview Questions
  • Hard Arrays Interview Questions
  • Hard Strings Interview Questions
  • Hash Maps Interview Questions
  • Linked Lists Interview Questions
  • Medium Arrays Interview Questions
  • Queues Interview Questions
  • Recursion Interview Questions
  • Sorting Interview Questions
  • Stacks Interview Questions
  • Systems Design Interview Questions
  • Trees Interview Questions

    • Popular Lessons

  • All Courses, Lessons, and Challenges
  • Data Structures Cheat Sheet
  • Free Coding Videos
  • Bit Manipulation Interview Questions
  • Javascript Interview Questions
  • Python Interview Questions
  • Java Interview Questions
  • SQL Interview Questions
  • QA and Testing Interview Questions
  • Data Engineering Interview Questions
  • Data Science Interview Questions
  • Blockchain Interview Questions
  • Arrays and Strings
  • API Gateway and Authentication
  • [Message Queue Case Study] Kafka Whitepaper Summary and Architecture
  • A Systems Design Interview Primer For New Engineers
  • Efficient Data Storage: Compression and Deduplication Strategies