{"id":811,"date":"2017-10-30T03:16:21","date_gmt":"2017-10-30T03:16:21","guid":{"rendered":"https:\/\/code-projects.org\/?p=811"},"modified":"2018-04-22T18:12:47","modified_gmt":"2018-04-22T18:12:47","slug":"syntax-javascripts-basics","status":"publish","type":"post","link":"https:\/\/code-projects.org\/syntax-javascripts-basics\/","title":{"rendered":"Syntax – JavaScript Basics"},"content":{"rendered":"

It is the set of the rules how programs are constructed.<\/p>\n

JS Programs :<\/strong><\/p>\n

A\u00a0computer program<\/strong>\u00a0is list of “instructions” to be “executed” by computer. These program instructions are called\u00a0statements\u00a0<\/strong>in programming language.
\nJS Statements are separated by semicolons<\/em>;<\/p>\n

<!DOCTYPE html>\r\n<html>\r\n<body>\r\n\r\n<h1>JS Statements<\/h1>\r\n<p id=\"ex\"><\/p>\r\n\r\n<script>\r\nvar x, y, z;\r\nx = 2;\r\ny = 8;\r\nz = x + y;\r\ndocument.getElementById(\"ex\").innerHTML = z;\r\n<\/script>\r\n<\/body>\r\n<\/html><\/pre>\n
Output :<\/strong><\/p>\n
\"\"<\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
JS Statement :<\/strong><\/p>\n
It is formed of Values, Operators, Keywords, Comments, and expressions.<\/p>\n
JS Values :<\/strong><\/p>\n
It defines two types of values:- Variable values and Fixed Values.\u00a0Variable values are called\u00a0variables\u00a0<\/strong>and fixed values are known Literals.<\/strong><\/p>\n
JS Variables :<\/strong><\/p>\n
To\u00a0store<\/strong>\u00a0data values variables are used. To\u00a0declare<\/strong>\u00a0variables the car keyword is used by Javascript. To\u00a0allow values<\/strong>\u00a0to variables, an equal (=) sign is used.<\/p>\n
<!DOCTYPE html>\r\n<html>\r\n<body>\r\n\r\n<h1>JS Variables<\/h1>\r\n<p id=\"ex\"><\/p>\r\n\r\n<script>\r\nvar x; \/\/x is defined as a variable. Then, x is assigned the value of 6\r\nx = 5;\r\ndocument.getElementById(\"ex\").innerHTML = x;\r\n<\/script>\r\n\r\n<\/body>\r\n<\/html><\/pre>\n
Ouput :<\/strong><\/p>\n
\"\"<\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
JS Literals :<\/strong><\/p>\n
The important rules for writing fixed values are: numbers<\/b>\u00a0are written with or without decimals.<\/p>\n
<!DOCTYPE html>\r\n<html>\r\n<body>\r\n\r\n<h1>JS Numbers<\/h1>\r\n<p id=\"ex\"><\/p>\r\n\r\n<script>\r\ndocument.getElementById(\"ex\").innerHTML = 10.50;  \/\/Numbers can be written with or without decimals\r\n<\/script>\r\n\r\n<\/body>\r\n<\/html><\/pre>\n
Output :<\/strong><\/p>\n
\"\"<\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
String are Text and it can be written within single or double quotations.<\/p>\n
<!DOCTYPE html>\r\n<html>\r\n<body>\r\n\r\n<h1>JS Strings<\/h1>\r\n\r\n<p id=\"ex\"><\/p>\r\n\r\n<script>\r\ndocument.getElementById(\"ex\").innerHTML = 'Code Projects';\r\n<\/script>\r\n\r\n<\/body>\r\n<\/html><\/pre>\n
Output :<\/strong><\/p>\n
\"\"<\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
JS Operators :<\/strong><\/p>\n
( + – *\u00a0 \/ ) Arithmetic Operators are used to\u00a0compute<\/strong>\u00a0values.<\/p>\n
<!DOCTYPE html>\r\n<html>\r\n<body>\r\n\r\n<h1>JS Operators<\/h1>\r\n\r\n<p id=\"ex\"><\/p>\r\n\r\n<script>\r\ndocument.getElementById(\"ex\").innerHTML = (2 + 2) * 10;\r\n<\/script>\r\n\r\n<\/body>\r\n<\/html><\/pre>\n
Output :<\/strong><\/p>\n
\"\"<\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
To assign values (=) assignment operator is used.<\/p>\n
<!DOCTYPE html>\r\n<html>\r\n<body>\r\n\r\n<h1>Assigning Values<\/h1>\r\n<p id=\"ex\"><\/p>\r\n\r\n<script>\r\nvar x, y;\r\nx = 8;\r\ny = 4;\r\ndocument.getElementById(\"ex\").innerHTML = x - y;\r\n<\/script>\r\n\r\n<\/body>\r\n<\/html><\/pre>\n
Output :<\/strong><\/p>\n
\"\"<\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
JS Expressions :<\/strong><\/p>\n
Expression is a combination of variables, values & operators, which computes to a value.<\/p>\n
<!DOCTYPE html>\r\n<html>\r\n<body>\r\n\r\n<h1>JS Expressions<\/h1>\r\n<p id=\"ex\"><\/p>\r\n\r\n<script>\r\ndocument.getElementById(\"ex\").innerHTML = 5 * 5;\r\n<\/script>\r\n\r\n<\/body>\r\n<\/html><\/pre>\n
Output :<\/strong><\/p>\n
\"\"<\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
The values can be numbers and strings.<\/p>\n
<!DOCTYPE html>\r\n<html>\r\n<body>\r\n\r\n<h1>JS Expressions<\/h1>\r\n<p id=\"ex\"><\/p>\r\n\r\n<script>\r\ndocument.getElementById(\"ex\").innerHTML = \"Code\" + \" \" + \"Projects\";\r\n<\/script>\r\n\r\n<\/body>\r\n<\/html><\/pre>\n
Output :<\/strong><\/p>\n
\"\"<\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
JS Keywords :<\/strong><\/p>\n
Keywords\u00a0are used to identify actions to be performed.\u00a0\u00a0var\u00a0keyword tells browser to create variables.<\/p>\n
<!DOCTYPE html>\r\n<html>\r\n<body>\r\n\r\n<h1>JS Keywords<\/h1>\r\n<p id=\"ex\"><\/p>\r\n\r\n<script>\r\nvar x, y;\r\nx = 2 + 2;\r\ny = x * 10;\r\ndocument.getElementById(\"ex\").innerHTML = y;\r\n<\/script>\r\n\r\n<\/body>\r\n<\/html><\/pre>\n
Output :<\/strong><\/p>\n
\"\"<\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
JS Comments :<\/strong><\/p>\n
Codes after double slashes (\u00a0\/\/ )<\/strong>\u00a0or between (\u00a0\/*<\/strong>\u00a0and\u00a0*\/ )<\/strong>\u00a0is known comment and it will not be executed.<\/p>\n
<!DOCTYPE html>\r\n<html>\r\n<body>\r\n\r\n<h1>Comments are not executed<\/h1>\r\n<p id=\"ex\"><\/p>\r\n\r\n<script>\r\nvar x;\r\nx = 5; \/\/ x = 6; I will not be executed\r\ndocument.getElementById(\"ex\").innerHTML = x;\r\n<\/script>\r\n\r\n<\/body>\r\n<\/html><\/pre>\n
Output :<\/strong><\/p>\n
\"\"<\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
JS Identifiers :<\/strong><\/p>\n
Identifiers are used to name variables (and keywords, and functions, and labels).\u00a0\u00a0First character must be a letter, or a dollar sign ($) or an underscore (_).<\/p>\n
JS is Case Sensitive :<\/strong><\/p>\n
Variables Code<\/b>\u00a0and code<\/b>, are two different variables.<\/p>\n
<!DOCTYPE html>\r\n<html>\r\n<body>\r\n\r\n<h1>Case Sensitive<\/h1>\r\n<p id=\"ex\"><\/p>\r\n\r\n<script>\r\nvar projects, Projects;\r\nlastName = \"Code\";\r\nlastname = \"Code\";\r\ndocument.getElementById(\"ex\").innerHTML = lastName;\r\n<\/script>\r\n\r\n<\/body>\r\n<\/html><\/pre>\n
Output :<\/strong><\/p>\n
\"\"<\/p>\n
 <\/p>\n
 <\/p>\n
 <\/p>\n
JS and Camel Case :<\/strong><\/p>\n
Hyphens:\u00a0 \u00a0<\/strong>\/\/this is not allowed in js.<\/p>\n
first-name, last-name, cr-card.<\/p>\n
Underscore:<\/strong><\/p>\n
first_name, last_name, cr_card.<\/p>\n
Upper Camel Case:<\/strong><\/p>\n
FirstName, LastName, CreditCard.<\/p>\n
Lower Camel Case:<\/strong><\/p>\n
firstName, lastName, creditCard.<\/p>\n
JS Character Set:<\/strong><\/p>\n
JS uses unicode character set and it covers\u00a0all characters, symbols & punctuations in the world.<\/p>\n","protected":false},"excerpt":{"rendered":"
It is the set of the rules how programs are constructed. JS Programs : A\u00a0computer program\u00a0is list of “instructions” to […]<\/p>\n","protected":false},"author":19,"featured_media":36151,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[4,216],"tags":[],"post_format":[],"class_list":["post-811","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutorial","category-jstutorial"],"yoast_head":"\nSyntax - JavaScript Basics - Source Code & Projects<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/code-projects.org\/syntax-javascripts-basics\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Syntax - JavaScript Basics - Source Code & Projects\" \/>\n<meta property=\"og:description\" content=\"It is the set of the rules how programs are constructed. 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