javascript basics examples

javascript basics examples.js

// expressions----------------------->
var mathResult = 1*10 + (200 / 3);

// an expression uses operators to give you a return value

//statement
if(false === true){
   console.log('WTF');
}
else{
  console.log('universe is OK');
}

//switch statement-------------------------->

switch(mathResult){
  case 100:  //if math result = 100
    console.log("math result is 100"); //write result is 100
    break; //something we have to write to seperate cases
  case 2:
    console.log("math result is 200");
    break;
  default: //you should always set a default aka. a code that will run if none of cases are true
    console.log("math is easy");
}
    
//switch statements will work with any value, not just math
//you'll only see break; in a switch statement
/*switch statements are just more readable than if/else statements sometimes; switch statements are always a if/else statement; just different stylistically*/

//Functions------------------------------>

//1. Function Declartion

function fullName(firstName, lastName){
  return firstName + ' ' + lastName;
}

console.log(fullName('Riva','Ridley'));

function sayName(name){
  console.log(name);
}

//2. Function expression

var getTotal = function(number1, number2){
  return number1 + number2;
};

getTotal();

  //console.log(getTotal(1,1)); will print 2....
  //var addition = getTotal (100,100)
//console.log(fullName('Riva','Ridley')); makes the function log/print out the answer using the function above


// Thunk example

var global = 100;

var thunk = function(){
  
  var number = 10;
  
  var returnFunction = function(){ 
    var inner = "i'm hidden";
    console.log(number, global, inner);
  }; //this is thunk
  
  return returnFunction; //this is calling the function
};

//function is a way of isolating values from the global scope
//purpose of functions is to set up scopes without influencing the purpose 
//closes values we want to protect from the global scope
////this function will log 10, 100, and im hidden
//we;re running the function where the getTotal will equal the total of number1 and number2 together

var newFunction = thunk(); //this is calling the thunk function, the above is just declaring it

newFunction();
console.log(thunk()); //this is returning the inner function of thunk (return function)

//FizzBuzz

for (var i = 1; i <= 100; i++) {
  
//this is a specific type of loop called a 'for loop'
//'for' is one way of setting up a loop.
//it is going through every number from 1-100, checking the if and else, and then incrementing by +1 and running the if else statment again until it reaches 100

  if (i % 3 === 0 && i % 5 === 0){
    console.log("FizzBuzz");}
  else if (i % 3 === 0){
    console.log("Buzz");
  } else if (i % 5 === 0){
    console.log("Fizz");
  } else {
    console.log(i);
  }
}

//for every

//3. Recurision (aka. Recursive Functions)

function fizzBuzzer(i){
  
  console.log(loopNumber);
  
  loopnumber--;
  if(loopNumber !== 0){
  fizzBuzzer(loopNumber);
} else; {
  return; //were not returning any value, we're just finishing the function ('returning' from it)
  }
}
fizzBuzzer(100);

//we are calling the function inside of itself (hence 'recursion') -- its going to loop forever. 
//recursive is a function that calls itself. 
//we have passed the loop number back to itself, and it's decrementing each time 
//counts down from 100-0 ; so we dont need a for loop