If I set only a high index in an array, does it waste memory?

by

See this topic:
are-javascript-arrays-sparse

In most implementations of Javascript (probably all modern ones) arrays are sparse. That means no, it’s not going to allocate memory up to the maximum index.

If it’s anything like a Lua implementation there is actually an internal array and dictionary. Densely populated parts from the starting index will be stored in the array, sparse portions in the dictionary.

More Related Contents:

  1. Have I reached the limits of the size of objects JavaScript in my browser can handle?
  2. Transposing a 2D-array in JavaScript
  3. How to find object in array by property in javascript?
  4. change values in array when doing foreach
  5. Fastest way to convert JavaScript NodeList to Array?
  6. How to convert uint8 Array to base64 Encoded String?
  7. Why do empty JavaScript arrays evaluate to true in conditional structures?
  8. How do I remove an object from an array with JavaScript? [duplicate]
  9. How to check whether multiple values exist within an Javascript array
  10. Converting JSON object to CSV format in JavaScript
  11. Importing data from multiple csv files in D3
  12. Filtering array of objects by searching nested object properties
  13. Convert string array to array in javascript
  14. Converting an array to a function arguments list [duplicate]
  15. Difference between Array.length = 0 and Array =[]?
  16. jQuery UI autocomplete with item and id
  17. Javascript Set vs. Array performance
  18. How to search for a string inside an array of strings
  19. Populate nested object from array?
  20. What is the concept of Array.map?
  21. What does [] mean in JavaScript?
  22. JavaScript foreach loop on an associative array object
  23. Can a JavaScript variable be used in plain HTML?
  24. Can forEach in JavaScript make a return? [duplicate]
  25. Why can’t I check if an array is empty with array == []?
  26. Why does the `map` method apparently not work on arrays created via `new Array(count)`?
  27. javascript – find unique objects in array based on multiple properties
  28. javascript – Convert array to string while preserving brackets
  29. How do I get the last 5 elements, excluding the first element from an array?
  30. JavaScript is in array [duplicate]

Leave a Comment