B322/individual/backend/s23/discussion/index.js

console.log("Hello B322!");

// [SECTION] if, else if and else Statement

let numG = -1;

// if statement
// executes a statement if a specified condition is true
if(numG < 0) {
	console.log('Hello');
}

/*
	Syntax 

	if(condition){
		statement
	}

*/

// The result of the expression added in the if's condition must result to true, else, the statement inside if() will not run.

// You can also check the condition. The expression results to a boolean true because of the use of the less than operator.

console.log(numG < 0); 
// results to true and so, the if statement was run.

numG = 0

if(numG < 0){
	console.log('Hello again if numA is 0!')
};

// It will not run because the expression now results to false:
console.log(numG < 0);

// Another sample

let city = "New York"

if(city === "New York"){
	console.log("Welcome to New York City!");
}


// else if Clause 
/*
  -Executes a statement if previous conditions are false and if the specified condition is true
  - The "else if" clause is optional and can be added to capture additional conditions to change the flow of a program. 

*/

let numH = 1;

if(numG < 0) {
	console.log('Hello');
} else if (numH > 0) {
	console.log('Hello from the other side');
}

// We were able to run the else if() statement after we evaluated that the if condition was failed. 

// If the if() condition was passed and run, we will no longer evaluate to else if() and end the process there.

let numA = -1

if(numA > 0) {
	console.log('Hello');
} else if (numH > 0) {
	console.log('World');
}

//else if() statement was no longer run because the if statement was able to run, the evaluation of the whole statement stops there.

// Let's update the city variable and look at another example:
city = "Tokyo"

if(city === "New York"){
	console.log("Welcome to New York City!")
} else if(city === "Tokyo"){
	console.log("Welcome to Tokyo, Japan!")
};

// Since we failed the condition for the first if(), we went to the else if() and checked and instead passed that condition.

// let num = 10;

// if (num > 0) {
// 	if (num < 5){
// 		console.log("Number is between 0 and 5");
// 	}else {
// 		console.log("Number is greater than or equal to 5");
// 	}
// }else {
// 	console.log("Number is less than or equal to 0");
// }


// if (num > 0 && num < 5) {
// 	console.log("Number is between 0 and 5");
// }else if (num >= 5) {
// 	console.log("Number is greater than or equal to 5");
// }else{
// 	console.log("Number is less than or equal to 0");
// }

if(numA > 0) {
	console.log('Hello');
} else if (numH === 0) {
	console.log('World');
} else {
	console.log('Again');
}

/*
	Since both the preceding if and else if conditions failed, the else statement was run instead. 

	Else statements should only be added if there is a preceding if condition.

*/

// else {
// 	console.log("Will not run without an if");
// }



// else if (numH === 0) {
// 	console.log('World');
// } else {
// 	console.log('Again');
// }

// if, else if and else statements with functions
/*
  - Most of the times we would like to use if, else if, and else statements with functions to control the flow of our application
  - By including them inside functions, we can decide when certain conditions will be checked instead of executing statements when the JavaScript loads.
  - The "return" statement can be utilized with condtional statements in combination with functions to change values to be used for other features of our application.

*/

let message = 'No message.';
console.log(message);

function determineTyphoonIntensity(windSpeed) {

	if (windSpeed < 30) {
		return 'Not a typhoon yet.';
	}
	else if (windSpeed <= 61) {
		return 'Tropical depression detected.';
	}
	else if (windSpeed >= 62 && windSpeed <= 88) {
		return 'Tropical storm detected.';
	}
	else if (windSpeed >= 89 || windSpeed <= 117) {
		return 'Severe tropical storm detected.';
	}
	else {
		return 'Typhoon detected.';
	}
}

message = determineTyphoonIntensity(110);
console.log(message);

/*
 - We can further control the flow of our program based on conditions and changing variables and results
 - The initial value of "message" was "No message."
 - Due to the conditional statements created in the function, we were able to reassign it's value and use it's new value to print a different output.

- console.warn() is a good way to print warnings in our console that cold help us developers act on certain output within our code
*/

if (message == 'Tropical storm detected.') {
	console.warn(message);
}

// [SECTION] Truthy and Falsy

// -In Javascript a "truthy" value is a value that is considered true when ecnountered in a Boolean context
// - Values are considered true unless defined otherwise
// - Falsy values/exceptions for truthy:
	/*
		1. false
		2. 0 
		3. -0
		4. ""
		5. null
		6. undefined
		7. NaN
*/

// Truthy Examples 
	// - If the result of an expression in a condition results to a truthy value, the condition retunrs true and the corresponding statements are executed
	// - Expressions are any unit of code that can bve evaluated to a value

if (true) {
	console.log('Truthy');
}

if(1) {
	console.log('Truthy');
}

if ([]) {
	console.log('Truthy');
}

// Falsy examples

if (false) {
	console.log('Falsy');
}

if (0) {
	console.log('Falsy');
}

if (undefined) {
	console.log('Falsy');
}

// [SECTION] Conditional (Ternary) Operator
/*
	- The Conditional (Ternary) Operator takes in three operands:
	- 1. condition
	  2. expression to execute if the condition is truthy
	  3. expression to execute if the condition is falsy
	- it can be used as an alternative to an "if else" statement
	-Ternary operators have an implicit "return" statement meaning that without the return keyword, the resulting expressions can be stored in a variable. 

	- It is commonly used for single statement execution.
*/


// Single statement execution
let ternaryResult = (1 < 18) ? true : false;
console.log("Result of Ternary Operator " + ternaryResult);

// Multiple statement execution
/*Both functions perform two seperate tasks which changes the value of the "name" variable and returns the result storing it in the "legalAge"
*/

let name; 

function isOflegalAge() {
	name = 'John';
	return 'You are of the legal age limit';
}

function isUnderAge() {
	name = 'Jane';
	return 'You are under the age limit';
}

let age = parseInt(prompt("What is your age?"));
console.log(age);
let legalAge = (age > 18) ? isOflegalAge() : isUnderAge();
console.log("Result of Ternary Operator in functions: " + legalAge + ', ' + name);


// [SECTION] Switch Statement

let day = prompt("What day of the week is it today?").toLowerCase();
console.log(day);

switch (day) {
	case 'monday':
		console.log("The color of the day is red");
		break;
	case 'tuesday':
		console.log("The color of the day is orange");
		break;
	case 'wednesday':
		console.log("The color of the day is yellow");
		break;
	case 'thursday':
		console.log("The color of the day is green");
		break;
	case 'friday':
		console.log("The color of the day is blue");
		break;
	case 'saturday':
		console.log("The color of the day is indigo");
		break;
	case 'sunday':
		console.log("The color of the day is violet");
		break;
	default:
		console.log("Please input a valid day");
		break;
}

// [SECTION] Try-Catch-Finally Statement

function showIntensityAlert(windSpeed) {
	try {

		alerat(determineTyphoonIntensity(windSpeed));

	} catch (error) {

		console.log(typeof error);
		console.warn(error.message);

	} finally {

		alert('Intensity updates will show new alert.');
	}
}

showIntensityAlert(56);