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DevCronin
DevCronin

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LEVEL UP with JavaScript! LVL 7

In this blog series tutorial, I will be covering some of the basic JavaScript programming concepts.

This is geared toward beginners and anyone looking to refresh their knowledge.

See the Previous Level Here

Level 7 will cover:

  • Store Multiple Values in One Variable Using JavaScript Arrays
  • Nest One Array Within Another Array
  • Access Array Data With Indexes
  • Modify Array Data

Store Multiple Values in One Variable Using JavaScript Arrays

Multiple values can be stored together by enclosing them with brackets [].
These can be any combination of strings and/or numbers.


let myArr = ["Natural", 20];

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Nest One Array Within Another Array

Nesting arrays within another array is also possible by using brackets inside of brackets.
This is referred to as multi-dimensional array.


let multiDimensionalArray = [
    ["Hit points", 30], 
    ["Damage", 15]
];

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Access Array Data With Indexes

Indexes are a way to reference and then access data inside of an array.
They use brackets and specify an entry in an array.
Arrays use Zero-based indexing (starts the count from zero).


let diceArray = [2,5,6,4,1,1];

diceArray[3];

// 4

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Modify Array Data

The entries of arrays are able to be changed, and this is referred to as mutable.


let diceArray = [2,10,8,7];

diceArray[0] = 4;

diceArray[0];

// 4

// Now the 2 in our array is 4

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Thank you for reading my blog! This is the seventh of my series on JavaScript so if you would like to read more, please follow!

See the Next Level Here

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Discussion (5)

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peppeg85 profile image
peppeg85

sorry but....where is the level UP

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devcronin profile image
DevCronin Author

*geared toward beginners

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peppeg85 profile image
peppeg85

ok, sorry, i read level up and thinked it was an advanced level post

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devcronin profile image
DevCronin Author

Its okay, I am still a beginner myself.

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apassiondev profile image
Andrea Ho

I wish beginners would be given more helpful information. It's even impractical in every aspect.