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script.js
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script.js
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document.write("<h1>Hello World from External JS!</h1>");
// alert("This is the dialog box!");
// this show alert
/*
This is multiline comment.
*/
var z;
z = 100;
var x = 10;
var X = 20;
// var first name; (invalid variable name)
// var 0firtstName; (invalid variable name)
// var first0Name; (valid variable name)
// var _firstName; (valid variable name)
// var $firstName; (valid variable name)
// var x+y; (invalid variable name)
/*
1- variables names cannot contain spaces
2- variables cannot start with a number
3- researved words cannot be used
4- variable names can start with any letter,
underscore ( _ ) or a dollar sign ($)
5- Subsequent characters maybe letters, digits,
underscore, or dollar signs.
*/
document.write(X);
var sayHello = "<br>\'Hello World!\'";
// \n new line
// \r cariage return
// \t tab
document.write(sayHello);
var isActive = true;
var isHoliday = false;
// +, -, *, /, %, ++, --
document.write("<br><br>");
var i = 19;
i++;
document.write(--i);
document.write("<br><br>");
document.write(i);