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VOOZH | about |
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VOOZH | about |
The author selected the Open Internet/Free Speech Fund to receive a donation as part of the Write for DOnations program.
In JavaScript, developers often spend a lot of time deciding the correct data structure to use. This is because choosing the correct data structure can make it easier to manipulate that data later on, saving time and making code easier to comprehend. The two predominant data structures for storing collections of data are Objects and Arrays (a type of object). Developers use Objects to store key/value pairs and Arrays to store indexed lists. However, to give developers more flexibility, the ECMAScript 2015 specification introduced two new types of iterable objects: Maps, which are ordered collections of key/value pairs, and Sets, which are collections of unique values.
In this article, you will go over the Map and Set objects, what makes them similar or different to Objects and Arrays, the properties and methods available to them, and examples of some practical uses.
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JavaScript is a high-level, object-based, dynamic scripting language popular as a tool for making webpages interactive.
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Software engineer and open source creator
Former Senior Technical Editor at DigitalOcean, fiction writer and podcaster elsewhere, always searching for the next good nautical pun! Areas of expertise include Node.js, PostgreSQL, CSS, JavaScript.
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This is a great article from which I learned alot.
Thank you.
hi, is there a way to get an item by index like in an array? for example, this doesn’t work: mymap[0]
in a map iterator object i am only able to get the next() element, but not directly the second or third, is there a way to get an item directly?
thanx, great article!
Excellent write-up!
Understandable. Thank you for your work.
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