jacqueslandrieu

/*
FUNCTIONS: PROGRAMS WITHIN PROGRAMS!
There are two phases to using functions. First we must declare (define) it.
We declare a function and name it square. We could put parameters in paranthesis "()":
*/

function square(number) {} 

/*
Now we can invoke/call/execute the function. It happens between curly brackets "{}".

jacqueslandrieu

/*
LOOPS: WHILE, FOR, FOR-IN
While loops are less popular than for loops. 
They are more manual and work better with numbers.
*/

var count = 0;
while (count < 11) {
    count++; // if you will miss this part, program will crash
} // prints 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10. It stopped at 11.

jacqueslandrieu

/*
CONTROL FLOW: IF, ELSE-IF, ELSE

Conditionals are great to use with booleans.
*/

var a = 1;
if(a > 0) {
  print('Yes');
} if (a === 1) {

jacqueslandrieu

/*
STRING MANIPULATION
The indexOf() method returns the index of (the position of) the first occurrence of a specified text in a string. 
Search() works the same way:
*/

var str = 'Find where the string starts';
var res = str.indexOf('s');
console.log(res); // prints 15, it means first 's' is at 15th character

jacqueslandrieu

/*OPERATORS

With special operators we could do many tasks, like assigning, comparing etc.

ASSIGNMENT. Use the "=" sign to assign values to variables:
*/

x = 1; // value of 1 is assigned to x

x += 1; // means x = x + 1

jacqueslandrieu

/*
DATA TYPES (Simple & Complex)

JavaScript has built-in data types, which are called simple or complex.

*Simple Data Types

Simple data types are data types whose values cannot be changed.

The simple data types are 

jacqueslandrieu

/*
* VARIABLES:
*
* Variables essentially function as placeholders for data/values. They can hold the place of things as simple 
* as a number, a string (e.g. var name = "Jacques") or Boolean to Arrays, Objects, or other data-types. 

* Variables... vary. Or at least they can if you want. You can change the value of a variable from a number 
* to a number, a number to a function, an oject to a function, etc. 

*HOW TO CREATE A VARIABLE?