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30-Days-Of-JavaScript
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Asabeneh 5 years ago
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10 changed files with 44 additions and 38 deletions
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2
01_Day/01_day_starter/index.html
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</head>
<body>
<h1>30DaysOfJavaScript:03 Day</h1>
<h2>Introduction</h2>
<button onclick="alert('Welcome to 30DaysOfJavaScript!');">Click Me</button>
<script src="./helloworld.js"></script>
<script src="./introduction.js"></script>

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02_Day/02_day_starter/index.html
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</head>
<body>
<h1>30DaysOfJavaScript:02 Day</h1>
<h2>Data types</h2>
<!-- import your scripts here -->
<script src="./main.js"></script>

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03_Day/03_day_starter/index.html
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</head>
<body>
<h1>30DaysOfJavaScript:03 Day</h1>
<h2>Booleans, undefined, null, date object</h2>
<!-- import your scripts here -->
<script src="./scripts/main.js"></script>

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04_Day/04_day_starter/04_day_starter/index.html
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<!DOCTYPE html>
<html>
<head>
<title>30DaysOfJavaScript</title>
</head>
<body>
<!-- import your scripts here -->
<script src="./scripts/main.js"></script>
</body>
</html>

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04_Day/04_day_starter/04_day_starter/scripts/main.js
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// this is your main.js script

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04_Day/04_day_starter/index.html
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<html>
<head>
<title>30DaysOfJavaScript:04 Day</title>
<title>30DaysOfJavaScript</title>
</head>
<body>

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04_Day/04_day_starter/scripts/main.js
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// this is your main.js script
alert('Open the browser console whenever you work on JavaScript')

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05_Day/05_day_starter/index.html
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</head>
<body>
<h1>30DaysOfJavaScript:05 Day</h1>
<h2>Arrays</h2>
<script src="./data/countries.js"></script>
<script src="./scripts/main.js"></script>

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05_Day/05_day_starter/scripts/main.js
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console.log(countries)
alert('Open the browser console whenever you work on JavaScript')
alert('Open the console and check if the countries has been loaded')

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readMe.md
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@ -227,10 +227,15 @@ If you installed visual studio code, let us start using it.
Open the visual studio code by double-clicking the visual studio icon. When you open it, you will get this kind of interface. Try to interact with the labeled icons.
![Vscode ui](./images/vscode_ui.png)
![Vscode add project](./images/adding_project_to_vscode.png)
![Vscode open project](./images/opening_project_on_vscode.png)
![script file](images/scripts_on_vscode.png)
![running script](./images/running_script.png)
![coding running](./images/launched_on_new_tab.png)
## Adding JavaScript to a web page
@ -298,6 +303,7 @@ This is how we write the internal script most of the time. Writing the JavaScrip
```
Open the browser console to see the output from the console.log()
![js code from vscode](./images/js_code_vscode.png)
### External script
@ -320,7 +326,7 @@ External scripts in the head
</head>
<body>
</body>
</html
</html>
```
External scripts in the body
@ -336,7 +342,7 @@ External scripts in the body
// Here is the recommended place to put the external script
<script src="introduction.js"></script>
</body>
</html
</html>
```
Open the browser console to see the output from the console.log()
@ -361,10 +367,11 @@ console.log('Hello, World!')
<script src ="./helloworld.js"></script>
<script src="./introduction.js"></script>
</body>
</html
</html>
```
Your main.js file should be below all other scripts. Watch out your exercise needs to understand this line.
![Multiple Script](./images/multiple_script.png)
## Introduction to Data types
@ -403,8 +410,8 @@ A boolean data type is either a True or False value.
**Example:**
```js
true # if the light on ,the value is true
false # if the light off, the value is False
true // if the light on ,the value is true
false // if the light off, the value is False
```
### Undefined
@ -445,6 +452,7 @@ There are two ways of commenting:
- _Multiline commenting_
```js
// commenting the code itself with a single comment
// let firstName = 'Asabeneh'; single line comment
// let lastName = 'Yetayeh'; single line comment
```
@ -466,10 +474,10 @@ Variables are _containers_ of data. Variables used to _store_ data in a memory l
For a variable that changes at a different time, we use _let_. If the data does not change at all, we use _const_. For example, PI, country name, gravity do no change, and we can use *const*.
* A JavaScript variable name should not begin with a number.
* A JavaScript variable name does not allow special characters except dollar sign and underscore.
* A JavaScript variable name follows a camelCase convention.
* A JavaScript variable name should not have space between words.
- A JavaScript variable name should not begin with a number.
- A JavaScript variable name does not allow special characters except dollar sign and underscore.
- A JavaScript variable name follows a camelCase convention.
- A JavaScript variable name should not have space between words.
The following are valid examples of JavaScript variables.
Valid variables in JavaScript:
@ -516,18 +524,21 @@ Let us declare variables with different data types. To declare a variable, we ne
```js
// Declaring different variables of different data types
let firstName = 'Asabeneh' // first name of a person
let lastName = 'Yetayeh' // last name of a person
let country = 'Finland' // country
let city = 'Helsinki' // capital city
let age = 100 // age in years
let isMarried = true
console.log(firstName, lastName, country, city, age, isMarried); //Asabeneh, Yetayeh, Finland, Helsinki, 100, True
// Declaring variables with number values
const gravity = 9.81; // earth gravity in m/s2
const boilingPoint = 100; // water boiling point, temperature in oC
const PI = 3.14; // geometrical constant
const gravity = 9.81 // earth gravity in m/s2
const boilingPoint = 100 // water boiling point, temperature in oC
const PI = 3.14 // geometrical constant
console.log(gravity, boilingPoint, PI); // 9.81, 100, 3.14
// Variables can also be declaring in one line separated by comma
let name = 'Asabeneh', // name of a person

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