How to use map() filter() reduce() | JavaScript Array Methods Tutorial
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- Опубликовано: 11 окт 2024
- Most important Array Methods Explained for Beginners | Learn Map, Filter, Reduce in JavaScript with Examples | Use array methods instead of foreach.
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JavaScript Map, Filter, Reduce tutorial for beginners with practical examples and detailed explanations of essential JavaScript array methods like map, filter, reduce, and foreach. Learn how to manipulate arrays efficiently with one-liners, apply functional programming concepts, and transform data using map, filter for filtering arrays, and reduce for combining elements. This tutorial covers the key differences between foreach and map, how to write cleaner and more efficient code, and when to use these powerful JavaScript methods to improve your development workflow.
What You'll Learn:
Using JavaScript Map Method: Transforming arrays with the map function to create new arrays with modified data.
Filtering Arrays with Filter: Learn how to use the filter method to extract specific elements from an array based on a condition.
JavaScript Reduce Method: Master the reduce function to accumulate or combine array elements into a single value.
JavaScript Foreach: Understanding the foreach loop for iterating over arrays without returning a new array.
Using map, filter, and reduce to apply functional programming principles for cleaner, more maintainable code.
Real-World Examples: How to use map, filter, reduce, and foreach in practical, real-world coding scenarios.
Array Methods in One Line: Writing concise code using array methods like map, filter, and reduce in a single line.
Difference Between Foreach and Map: Learn when to use foreach and map
Array Manipulation: Learn to modify, filter, and reduce arrays efficiently for faster JavaScript development.
Key Points:
Map, Filter, Reduce in JavaScript: Core array methods used for transforming, filtering, and reducing data in JavaScript.
Efficient Array Manipulation: Improve performance by using built-in array methods.
Foreach vs Map: When to use foreach for iteration and map for returning a new array.
Practical Examples:
Filter an Array: Remove unwanted items from an array, like filtering a list of products based on price or color.
Transform an Array with Map: Create new arrays by modifying values, like formatting strings, numbers, or dates.
Summarize Data with Reduce: Combine array elements to calculate the total in a shopping cart.
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Any video from you is great. You present every function in detail and practically. If a person doesn't understand it after your video, he probably never will... Thanks
Thank you so much 🤗
the best... video on map, filter, reduce
pls make one on async -> callbacks, promise,...
bro please make a javascript full course like the html css course, it was the best course i have ever bought and i would 100% buy a javascript course from you
Pls make a playlist on DOM manipulation 🙏
Excellent tutorial!!! I must say by far the most high quality, precise one in web dev I have seen in a month. Please more JS/DOM related tutorials. Btw, which VSCode theme do you use? Looks pleasing on the eyes. Thanks in advance. Keep dev'ing!
Thanks for the kind words 💙 There will be more javascript videos (and dom) in the future. My VS Code theme is Palenight but in the video I am actually using a different app for coding. It's called RunJS, which is a simple javascript playground with integrated console. If I just want to try out a few code examples I use that app so that I don't have to setup an html file, open the browser console etc. For development I would not use it as it has very limited features but when I simply want to mess around with a little bit of js code, it is faster and simpler to use RunJS.
@@coding2go Thanks for your explanation. The theme looked well colored to me. I used Palenight for a while, but somehow switched to the GitHub Dark Theme.
Great video ❤ please install more js😅
can you create a tutorial on how to properly use the css units such as, rem, em, % and px, pls
Can you do a tutorial on function and Dom please 😊😊😊
Thanks you so much for this precious video
Great tutorial
Is there any explanation, regarding those 3 parameter?
Like what's arr, i, price means?
Im still new
You could watch my video on the foreach method to find out what these parameters do. They work the same in all of these methods. Hope that helps ✌️
@@coding2go thanks
can u make a tutorial on JS
This is a tutorial on js. How about can u make more on ts lol
may i have questions?🙇🏻♂️🙇🏻♂️
6:43 no { }
6:53 having { }
when to have the difference to use { } or not?
He used short arrow function
This is the one-line arrow function that I explained at 2:44.
You could write both examples in one line, but I decided to use an extra line because the &&- condition was too long.
0:30 This reference is not LOST on me.
👀
Need dsa in python.
If l join as a member can l get Access to all videos
Yes you will. Our "members-only" videos are the individual lessons from our html css udemy course uploaded on RUclips. By joining you unlock every video on this channel.
What software is being used here?
I am using RunJS, which is just a simple javascript playground with integrated console. If I just want to try out a few code examples I use that app so that I don't have to setup an html file, open the browser console etc.
Awesome . I'm super grateful that I know this now !
Glad I could help!
Make js course
Laptop is cheaper than smartphone 😂
Well, it depends?
Just so you know, the best way to use filter and reduce and forEach etc. is to not.
Don't use them.
Use a loop.
Loops will seriously uncomplicate your code. Half of these methods need a callback that looks the same but does different things, and all of them are slower than a loop (and I hate slow websites).