app.js

// variable with type
// const
// operation
// comparisation
// condition
//loop
//function
// ds
//dsfdfsdfdsf

/*
1 byte = 8 bit 


*/

var x = 15

// azAZ$_ 
//azAZ_$09
//var _st_$3 = "Ecoin"
//  number  string  boolean  object array

var num1 = 25  // integer
var num2 = 36.9  //float
var num3 = 20195.98745 // double


var str1 = "Welcom to ecoin"  // String
var str2 = 'A'  // String  char

var isAdmin = true //boolean bool
var isUser = false  // boolean

//console.log(str1)

//console.log(num2)

var tab = [45, 36, "Ecoin", true, 2016]

//console.log(tab)

var tab2 = new Array(45, 36, 9, 8, 7)
//console.log(tab2)

var tab3 = new Array()
tab3[0] = "Ecoin"
tab3[1] = 28
tab3[2] = 2.66
tab3[3] = 203
tab3[4] = false

//console.log(tab3)

//console.log(typeof tab2)

var tab4 = [14, 36, "Ecoin", 2023]
tab4['test'] = 88

//console.log(tab4)

//Object

var student = { nom: "Ahmed", prenom: "kadri", age: 25 }

//console.log(student.age)
//console.log(typeof student.age)

const PI = 3.14

//console.log(PI)

const project = "Ecoin"

//   +  -  *   /  %  
var x = 25
/*
console.log(x + y)
console.log(x - y)
console.log(x * y)
console.log(y / x)
console.log(y % x)

*/

//x = x + 9 // x+=9 
/*x += 9
console.log(x)
x = x - 9 // x-=6
x = x * 9 // x*=6
x = x / 9 // x/=6
*/

//x = x + 1 // x++  /incrementation
//x++ // x--

//console.log(++x) //25
//console.log(x++) //25


var a = 19
var b = 23
// == !=  >   >=  <  <=  ! ===
var t = a > b
//console.log(!t)

var c1 = 25
var c2 = "25"

//console.log(c1 === c2)

//console.log(true & true)
/*
true && true ===> true
true && false ===> false
false && true ===> false
false && false ===> false


true || true ===> true
true || false ===> true
false || true ===> true
false || false ===> false
*/

// condition  nested if
/*var x = 45
if (x >35) 
    console.log("Yes");
else if (x > 25)
    console.log("X > 25")    
 else
    console.log("OK")

console.log("Ecoin")
*/
/*
var a1 = prompt("please enter number1")
a1 = parseInt(a1)
var a2 = prompt("please enter number2")
a2 = parseInt(a2)
if (a1 > a2) {
    console.log("A1 > A2")
} else if(a1 < a2) {
    console.log("A2 > A1")
} else {
    console.log("A2 = A1")
}
*/
//console.log(typeof a1)
 //a1 a2 a3  >=
 /*
a, b, c
a >= b ==> t ==> a >= c 
       ==> f ==> b >= c

       */

/*
var a = prompt("please enter number1")
a = parseInt(a)
var b = prompt("please enter number2")
b = parseInt(b)
var c = prompt("please enter number2")
c = parseInt(c)
if (a >= b ) {
    if (a >= c) {
        if(a%2==0) console.log(a+" is pair")
        else console.log(a+" is impair")
    } else {
        if(c%2==0) console.log(c+" is pair")
        else console.log(c+" is impair")
    }
} else {
    if (b >= c) {
    if(b%2==0) console.log(b+" is pair")
        else console.log(b+" is impair") 
    }else {
        if(c%2==0) console.log(c+" is pair")
        else console.log(c+" is impair")
    }
}
*/

//loop

var i = 1
while (i<=5) {
    console.log("Ecoin"+i)
    i++
}

var j = 1
do {
    console.log("JS "+j)
    j++
}while(j<=10)

var t = []
var t2 = new Array()
var s = 0
while (s <= 4) {
    t[s] = "Ecoin " + s
    s++
}

console.log(t)

var s1 = 0
while (s1 <= 4) {
    console.log(t[s1])
    s1++
}
// for loop
for (var i = 0; i < 10; i++){
    console.log("Ecoin "+i)
}

for (var j = 50; j > 0; j--){
    console.log("Ecoin "+j)
}

var k = 50
while (k > 0) {
    console.log("JAVASCRIPT " + k)
    k--
}

var m = 50
do {
    console.log("JAVASCRIPT " + m)
    m--
} while (m > 0)


var arr = ["com", "com", "net", "org", "com", "dz", "com"]  // 4
var s = "fr"
var cpt = 0
//console.log(s.length)
for (var i = 0; i < arr.length; i++){
    //console.log(arr[i])
    if (arr[i] == s) 
        cpt++
}
console.log(cpt)
var t = []
var w = ["Alger", "Blida", "Oran", "Batna"]
for (var i = 0; i < w.length; i++){
    t[i] = w[i].length
    console.log(t[i])

}

for (var i = 0; i < w.length; i++){
    console.log(t[i])
}

    //    0   1   2  3   4  5 6
tab = [45, 50, 9, 88, 5, 200, 7]

var max = tab[0]

for (var i = 0; i < tab.length; i++){
    if (tab[i] >= max)
        max = tab[i]  //200
}



console.log(max)
var j = 1
while (j <= 5) {
    console.log(j)
    j++
}

var j = 1 
do {
    console.log(j)
    j++
}while(j<=5)

for (var j = 1; j <= 5; j++){
    console.log(j)
}
var j = 1
for (; ;){
    if(j > 5) break
    console.log(j)
    j++
}

var x, y, z
x = 100
y = 6
z = x //z = 100
x = y //x = 6
y = z // y = 100



var ages = [15, 36, 5, 25, 9, 100, 45]


var i = 0
while (i < ages.length) {
    

    i++
}


//7 execercice
// sort min max duplication counters length
//function
// var global - local

app2.js

//var ages = [15, 36, 5, 25, 9, 100, 45]
/* var nom = "Ecoin"
var student = {nom:"ahmed",age:25,email:"[email protected]"}
console.log(ages.length)
console.log(nom.length)
console.log(student.email.length) */

/*  var i = 0
 while (i < ages.length) {
    
      console.log(ages[i])
     i++
}
 
console.log("============================");
var i = 0 
do {
      console.log(ages[i])
     i++
}while(i< ages.length)
console.log("============================");

for (i = 0; i < ages.length; i++){
      console.log(ages[i])
}
 */
var student = {nom:"ahmed",age:25,email:"[email protected]"}
/* for (a in student) {
    console.log(student[a]);
} */
/* for (b of ages) {
    console.log(b);
}
 */

var ages = [15, 36, 5, 25, 9, 100, 45]  // 5 9 15 25 36 45 100
/*console.log(ages);
ages.sort()
console.log(ages);*/
/* var sort = []



var p = 0 
var s = 0
for (var j = 0; j < ages.length; j++) {
    var min = 99999999999999
        for (var i = 0; i < ages.length; i++) {
        if (min>=ages[i] && ages[i]!=-1) {
            min = ages[i]  //15   5  //  15  9
            s = i   // 0  2  // 0  4
            }
    }
    ages[s] = -1
    sort[j] = min
    
}

console.log(ages);
console.log(sort); */



//7 execercice
// sort min max duplication counters length
//function
// var global - local
function sum(a,b) {
     return a + b
 }


var res = sum(8, 3)

//console.log(res);
 

function calc(a, b, op) {
    switch (op) {
        case '+':
            console.log(a + b)
            break
        case '-':
            console.log(a - b)
            break
        case '*':
            console.log(a * b)
            break
        case '/':
            console.log(a / b)
            break
        default:
            console.log("No operation");
            break
    }
}

//calc(18,3,"+")
 //c = "t"
//var nom = "Welcom to Ecoin"  ==> true

function checkChar(nom, c) {
    var st = {
        ischeck: false,
        cpt: 0
}
    for (var i = 0; i < nom.length; i++) {
        if (nom[i] == c) {
            st.ischeck = true 
            st.cpt++
        } 
        
    }
    return st
}  
result = checkChar("This is Javascript",'i')
//console.log("the char is "+result.ischeck+ " Cpt = "+result.cpt);


var tab = [45, 36, 9, 8, 8, 14]
console.log(tab);
tab.push(99)
console.log(tab);
tab.pop()
tab.pop()
tab.push(155)
//console.log(tab.indexOf(100));



var t1 = [36, 36, 36,36,25, 8, 25, 14]     
function removeT(t) {
    var sec = []  // 45  36  9 25
    for (i = 0; i < t.length; i++){
        var v = t[i]
        if (sec.indexOf(v) < 0) {
            sec.push(v)
        }
    }
    return sec
} 

console.log(removeT(t1));
var t2 = [5, 88, true, 36, 25, "A", 100, "C"]  
        //[5,88,10,36,25,100]//

function noChar(t) {
    var sec = []  
    for (i = 0; i < t.length; i++){
        var v = t[i]
        if (typeof v == "number") {
            sec.push(v)
        }
    }
    return sec
}
        
console.log(noChar(t2));

app3.js

//let block variable
//var fun vari
var t3 = 49  //global
if (true) {
let s1 = 45  // local
var s2 = 55  // global
console.log(s1);//45
console.log(s2);//55    
}
//console.log(s1);//45
console.log(s2);//55

/* function ecoin() {
    let s1 = 66
    let s2 = 100  //local
    console.log(s1); //66
    console.log(s2); //100
}

ecoin()
console.log(s1);
 */