tryjs.html

<script type="text/javascript">

var num=10+2;
// console.log("Hello World !");
document.write('Hello, the number is ' + num);
document.write('<br>');
document.write('Every result is in console, please visit console.');

var first = 'hello ';
var second = 'world';

var result = first.concat(second);
console.log(result);

// var colors = new Array('red', 'green', 'blue');
//              OR
var colors = ['red', 'green', 'blue'];


console.log(colors[1]);
colors[1]='cyan';
console.log(colors[1])
console.log(colors);

colors.push('voilet');
console.log('Added new color: '+colors);

colors.pop();
console.log('Removed last color: '+colors);

colors.reverse();
console.log('Reversed color: '+colors);

colors.sort();
console.log('Sorted color: '+colors);

console.log('Length of color: '+colors.length)

if (num==12) {
    console.log('Number is equal to '+num);
} else {
    console.log('Number is not equal to '+num);
}

if (num>0) {
    console.log(num+' is Positive.');
} else if (num<0) {
    console.log(num+' is Negative.');
} else {
    console.log(num+' is equal to 0.');
}

switch(num)
{
    case 5:
        console.log('Num is equal to 5');
        break;
    case 10:
        console.log('Num is equal to 10');
        break;
    case 12:
        console.log('Num is equal to 12');
        break;
    case 15:
        console.log('Num is equal to 15');
        break;
    default:
        console.log('Num is '+num);
}

function changeVariableValue()
{
    num=8;
}
// console.log(num);
changeVariableValue();
console.log('New number is '+num);

function increase(_num)
{
    _num++;
    console.log('_num is '+_num);
}
increase(num);
console.log('num is '+num);

var numObject = [10, 20, 30];
function numIncrease(_num, _numObject)
{
    _num++;
    _numObject[0]++;
    console.log('_num is '+_num+' and _numObject[0] is '+_numObject[0]);
}
numIncrease(num, numObject);
console.log('num is '+num+' and numObject[0] is '+numObject[0]);

function changeArray(_numObject)
{
    _numObject = new Array('turtle', 'chicken', 'rabbit');
    console.log('_numObject[0] is '+_numObject[0]);
}
changeArray(numObject);
console.log('numObject[0] is '+numObject[0]);


function add(_num1, _num2)
{
    return _num1+_num2;
}
var num = add(12, 5);
// console.log(add(10,10));
console.log('Adding num1 and num2: '+num);


for (var i=0; i<=10; i++)
{
    console.log(i);
}

for (var i=0; i<colors.length; i++)
{
    console.log('The color is: '+colors[i]);
}


var numRows=10;
for (var currentRow=1; currentRow<=numRows; currentRow++) {
    var stars="";
    for (var numStars=1; numStars<=currentRow; numStars++) {
        stars = stars+'*';
    }
    console.log(stars);
}


var i=0;
while (i<10) {
    console.log(i);
    i++;
}

console.log('------------ Even numbers ------------')

var currentNum = 0;
var maxNum = 20;
while (currentNum <= maxNum) {
    if (currentNum % 2 ==0) {
        console.log(currentNum);
    }
    currentNum++;
}




</script>