JavaScript

Is a programming language that is core of Web.

Setup

• Install NodeJS on Ubuntu

Language

Syntax

Command	Action
//	Comment

Data Types

Types	Content
boolean	true / false
number	123
string	"hello"
array	[1,2,["a","b"]]
object	{"color":"red"}

Conversion

• From string to float: var floatValue = +(val);

Array

Transpose an array:

array = [ ["a", "b"],["c", "d"]]
array[0].map((_, colIndex) => array.map(row => row[colIndex]))

Functions

Simple test that return a JSON with true:

if (a === true ){
    return {b} ;
} else if (condition 1 && condition 2) {

} else {
    // do something
}

Logical operators

Operator	JavaScript
AND	&&
NOT	!
OR	||
Equal	==

Generate chars

Use Chart.js