Getting Comfortable with the ES5 Array Methods in JavaScript

JavaScript supports higher order functions and good examples of the use of higher order functions can be found in the array methods that were introduced as a part of the ECMAScript 5 standard. This video presents 7 methods that are attached to the Array object: forEach, map, filter, every, some, reduce and reduceRight. We will discuss how they work and provide examples.

For a complete list of all our tutorials:

Take the Learn Modern JavaScript: Getting Started or the Learn Modern JavaScript: Advanced Topics courses at a huge discount:

[dansmar_]

Coming here five years after the upload of this tutorial video. I just found it amazing! Thanks for creating such great contents

[RameenFallschirmjager]

You deserve much more broader fan base! Your tutorials are amazingly understandable!

[mymusic]

Thank you - This is better than what I was looking for - Really well explained.

[DanielWeikert]

Great work. Highly appreciated. Could you also create a video where you elaborate best practices / modern javascript (ES6, ...) and which functions/methods should not be used anymore?

[andig]

At 24:20 you say the first argument is the ongoing accumulated value. So how then at 26.50 are you testing against that value to find the highest number? It doesn't make sense as the accumulator will keep increasing in size & the ternary will therefore always return as true..
and the output of 100 195 230 295... where's my logic going wrong?

[jainshilpi]

waoo thanku, you are a great teacher can you please share some more complex examples by implementing these methods?

[zootsoot]

Great class, thank you! So the way to think about the accumulator in the anonymous function passed into the reduce method, is that it begins as the first element and then becomes whatever is returned from the function? So for the max one, if 'val' is greater than 'high;, that val then becomes the accumulator, i.e. becomes 'high' in the next iteration?

[seenuvasanv]

Hello boss, what is the word you mention for filter method? Can U spell that?

[Odisej]

This is some serious shit. This is some good stuff.

[shravanipl]

Nice explanation ... And basically, every() is similar to "AND" operation and some() similar to "OR". Am I right?