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JavaScript Higher Order Functions & Arrays



In this video we will look at some of the very powerful higher order functions and working with arrays. We will look at forEach, map, filter, reduce and sort.

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CODE: JSFiddle
https://jsfiddle.net/bradtraversy/e5rb0x0a/

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Original source

d4mer

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22 responses to “JavaScript Higher Order Functions & Arrays”

  1. Thank you very much for this proper explanation! Just one bit of feedback; at some moments you excuse the listener for the noise in the background. It's only because you're saying it that I'm noticing it. It seems like the one who's bothered most about it is you. The quality of your content of good so don't worry about it :).

  4. 7:53
    You can still make the code less without using if statement and the fat arrow function.
    Instead of :
    const canDrink=ages.filter(function(age){
    if(age>=21){
    return true;
    }
    });

    console.log(canDrink);

    You can use:

    const canDrink= ages.filter((age)=>{
    return age>=21; });

    console.log(canDrink);

  7. One more thing: I do really like this less hands-on videos because this way we can better understand methods and syntax, and how to do things on our own (which is very important).
    I don't mean that the follow-along vids are not good! They also are… I guess a 50-50 mix of both is best in my book (or 60% practice, 40% explanations perhaps)…
    I find that on my level, when you are going from beginner to intermediate, one of the challenges we find is to be daunted when we have to complete projects without following along, because we thought we knew something but in reality we have no idea where to start when we have to implement and no-one is there to hold our hands…

  8. Hi Brad, you are too awesome (and I don't say it to be slimey cause I hate that, but credit is due when due, and here it is due…).
    My question is: you mention you'd add some more content on the ´higher order functions´to your Modern JS Course in Udemy. I was looking into buying this course for a while (impediment until now being the perceived lack of time to follow it…), and if this was explained in more detail there it'd make it even more interesting and raise it above on my list of courses to buy and follow.
    Thank you again, your help is invaluable as always <3
    L. (a female programmer in da making)

  20. I really like this video, very helpful. I tried to replicate it in Atom but I received the following error: "W104 – 'const' is available in ES6 (use 'esversion: 6) or Mozilla JS extensions (use Mozzarellas). I have come across this several times and I don't understand what I need to do. (I am just learning – please help if you can,). Ronald.hirshauer@gmail.com. TY

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