Map data structure & ES6 map object - Beau teaches JavaScript

Maps are data structures that store key-value pairs. See how they work and learn about the ES6 map object.

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[MrRight]

Correction @ 4:28
map.entries() - returns keys + entries
map.keys() - returns keys

[jamster]

These tutorials are excellent! The length is perfect and seeing a new concept or an old one in a different context is so useful. Thanks!

[sassmailsas]

So, the benefit of Map is that you can use key not only String or Symbol. But in your example you use Object as as collection to store key:value. It's wrong implementation. You need to use array as collection with item {key: key, value: value}

[goodwish]

Very good explanation. Thank you teacher.

There might be one issue. It is the count++ in set method.
If we add item with existing key, it should not increment the count.

My CA$ 0.02. ;)

[crashito_x]

Man you are amazing at explaining this stuff

[admiralrohan]

I am facing problems for using these new syntax of ES6... can't remember syntax at the time of programming... what to do?

[TonyJPG]

Hello, why do you make a size function (the one that returns the variable count), can't you just call the variable count directly?

don't myObj.count and myObj.size() return the same value?

[core_dump]

Maps are useful for practical programming and Competitive programming alike.

[Jordanistheonlyholywaterriver]

Watch 2x speed but we about 40-50 videos a week.

[grantpant]

Your typing speed literally makes my head spin. I don't think I can even make my fingers moves that fast. You're an android, aren't you?

[sethkoch]

This is entirely incorrect. A map is not a javascript object. You would not, for example, be able to use a function as a key in your implementation. This is a very naive and very wrong tutorial. You should take this video down.

[anantvarma]

Couldn't understand a single thing after watching it thrice. Rushing through the code without explaining anything. By far the worst explanation.