Variables in JavaScript

organduo in #palnet • 3 years ago (edited)

Today I learned the introduction to variables in JavaScript:

https://www.learn-js.org/en/Variables_and_Types

The exercise was to write the following variables:

A number called myNumber which contains the number 4;
A string called myString which contains the sentence Variables are great.;
A boolean called myBoolean which contains the value false;

It was much harder than yesterday to write "Hello, World!". But finally I came up with this code:

1 var myNumber=4;
2 var myString="Variables are great.";
3 var myBoolean=false;
4 console.log("myNumber is equal to " + myNumber);
5 console.log("myString is equal to " + myString);
6 console.log("myBoolean is equal to " + myBoolean);

Did I write it correctly?

PS I didn't know how to do single spaced code in Markdown. Any suggestions?

#neoxian #javascript #programming #coding #stem #marlians #sct

3 years ago in #palnet by organduo

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contrabourdon 3 years ago

Very good. Perhaps not include the line numbers in your code sharing though.

Here's a test for you...how do you swap the contents of these two variables?

var a = 1;
var b = 2;

// how would you make a = b and b = a?

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organduo 3 years ago

Maybe this way?

var myNumber=2;
var myNumber=1;

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contrabourdon 3 years ago

'a' and 'b' could contain anything, so we can't just assign a = 2, b = 1. Also in your answer, you have declared the variable name 'myNumber' twice. I don't think that is permitted in that context.

Here's the solution:

var a = 1;
var b = 2;

// swap 'a' and 'b'

var temp = a;  // contains 1
a = b;  // contains 2
b = temp;  // contains 1

Does that make sense?

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1 vote

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organduo 3 years ago

I see... It's above my pay-grade, haha! Tomorrow I will pick up a book JavaScript for Kids I ordered from Amazon. Do you prefer to study from books or from online sources?