Basic Data Structures

Data can be stored and accessed in many ways. You already know some common JavaScript data structures — arrays and objects.

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Table of contents

• Use an Array to Store a Collection of Data
• Access an Array's Contents Using Bracket Notation
• Add Items to an Array with push() and unshift()
• Remove Items from an Array with pop() and shift()
• Remove Items Using splice()
• Add Items Using splice()
• Copy Array Items Using slice()
• Copy an Array with the Spread Operator
• Combine Arrays with the Spread Operator
• Check For The Presence of an Element With indexOf()
• Iterate Through All an Array's Items Using For Loops
• Create complex multi-dimensional arrays
• Add Key-Value Pairs to JavaScript Objects
• Modify an Object Nested Within an Object
• Access Property Names with Bracket Notation
• Use the delete Keyword to Remove Object Properties
• Check if an Object has a Property
• Iterate Through the Keys of an Object with a for...in Statement
• Generate an Array of All Object Keys with Object.keys()
• Modify an Array Stored in an Object