JavaScript Reference Book: JAVASCRIPT: THE INTERNET PROGRAMMING WARRIOR Full JavaScript Tutorial

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(Javascript)✳️ LESSON 1: VARIABLES AND STATEMENTS💻
> JS Variables are containers for storing information.
JavaScript statements often start with a statement identifier to identify the JavaScript action to be performed.

> JS Statement identifiers are reserved words and cannot be used as variable names (or any other things).
Eg:- break, class, const, let, for , var ,,....etc


❓HOW DO WE DECLARE AND INITIALIZE iN JS?⁉️

LET:_ The let declaration declares a block-scoped local variable, optionally initializing it to a value.

// Create a variable to store the city

let city = 'Philadelphia'

// Create a variable to store the state

let state = 'Pennsylvania'

// Create a variable to combine the city and state

let location = city + ', ' + state

// Print the combined location to the terminal( console)
console.log(location)

Example 2:_ Let's strore numbers

// Create a number and assign to a variable

let age = 26

// Add

let addResult = age + 1

// 27
// Subtract

let subtractResult = age - 26.5

// Multiply

let multiplyResult = age * 10

// Divide

let divideResult = age / 2

// -0.5
// 260
// 13
// Parenthesis can be used to make sure

⛔️Note that JS comments allow you tp document your code. The content of your comment id for human only.
//look the above comment lines like this

Question for you??⁉️⁉️

What are the other key words used to declare variables in JS other than LET??
[ comment your answer below ]
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✳️LESSON 2 : Booleans and Comparison Operators

📝The Boolean object represents a truth value: true or false.
📌Any object, including a Boolean object whose value is false, evaluates to true when passed to a conditional statement.

for More click here "Boolean «📥

✅A comparison operator compares its operands and returns a boolean value based on whether the comparison is true.
⚽️These are >= , <= , = ,!= ...etc
@the operators can categorized as follows

+ Primary expressions
+ Left-hand-side expressions
+ Increment and decrement operations
+ Unary Operators
+ Arithmetic Operators
+ Relational Operators
+ Equality Operators
+ Bitwise Shift Operators
+ Binary bitwise operators
+ Binary bitwise operators
+ Binary logical operators . ..... etc

Eg;_ with different operator types

// === equal
'Andrew' === 'Andrew' // True
'Mike' === 'mike' // False
// !== not equal
'Andrew' !== 32 // True
12 !== 12 // False
// < less than
3 < 40 // True
3 < 3 // False
// <= less than or equal to
// 3 <= 3 // True
// 0 <= -23 // False
// > greater than
16 > -16 // True
-16 > 16 // False
// >= greater than or equal to
-23 >= -40 // True
100 => -100 // False

LESSON 3:IF and Advanced IF statements

⚾️if...else

The if...else statement executes a statement if a specified condition is truthy. If the condition is falsy, another statement in the optional else clause will be executed.

function testNum(a) {
  let result;
  if (a > 0) {
    result = 'positive';
  } else {
    result = 'NOT positive';
  }
  return result;
}

console.log(testNum(-5));
// expected output: "NOT positive"

more on >👉 IF MDN 📥»CLICK ME

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What's your emoji for JavaScript?

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LESSON 4: FUNCTIONS IN JAVASCRIPT

There are three important pieces to create a function:
😡 1. Arguments - they are values passed into a function. if i create a function that validates an email, I'd need to accept the email as a function argument.
💻 2. Function Code- the function code is what goes inside of the curly braces. This is where you define what your function does.
📥3. Return Value - This is a part of the function code. It lets you define what value to send back to the function caller.

🤳🤳🏃🏼🏃🏼
Let's see the snippet using a function #[

fahrenheitToCelsius]#


let fahrenheitToCelsius = function (fahrenheit) {
const celsius = (fahrenheit - 32) * (5 / 9)
return celsius
}
let temp70 = fahrenheitToCelsius(70)
console.log(temp70)
let temp32 = fahrenheitToCelsius(32)
console.log(temp32)

| RUN | | COMPILE |

LESSON 5: null and undefined in JS

🥃The null value represents the intentional absence of any object value.
🎭The global undefined property represents the primitive value undefined. It is one of JavaScript's primitive types.

more on:-
Null - undefined -

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