{"id":2196,"date":"2022-04-12T16:02:08","date_gmt":"2022-04-12T16:02:08","guid":{"rendered":"https:\/\/mdr.foobrdigital.com\/?p=2196"},"modified":"2022-04-12T16:02:08","modified_gmt":"2022-04-12T16:02:08","slug":"javascript-variable","status":"publish","type":"post","link":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/2022\/04\/12\/javascript-variable\/","title":{"rendered":"JavaScript Variable"},"content":{"rendered":"\n

A JavaScript variable<\/strong> is simply a name of storage location. There are two types of variables in JavaScript : local variable and global variable.<\/p>\n\n\n\n

There are some rules while declaring a JavaScript variable (also known as identifiers).<\/p>\n\n\n\n

  1. Name must start with a letter (a to z or A to Z), underscore( _ ), or dollar( $ ) sign.<\/li>
  2. After first letter we can use digits (0 to 9), for example value1.<\/li>
  3. JavaScript variables are case sensitive, for example x and X are different variables.<\/li><\/ol>\n\n\n\n
    \n\n\n\n

    Correct JavaScript variables<\/h2>\n\n\n\n

    <\/a><\/a><\/a><\/p>\n\n\n\n

    1. var x = 10;  <\/li>
    2. var _value=”sonoo”;  <\/li><\/ol>\n\n\n\n
      \n\n\n\n

      Incorrect JavaScript variables<\/h2>\n\n\n\n

      <\/a><\/a><\/a><\/p>\n\n\n\n

      1. var  123=30;  <\/li>
      2. var *aa=320;  <\/li><\/ol>\n\n\n\n
        \n\n\n\n

        Example of JavaScript variable<\/h2>\n\n\n\n

        Let\u2019s see a simple example of JavaScript variable.<\/a><\/a><\/a><\/p>\n\n\n\n

        1. <<\/strong>script<\/strong>><\/strong>  <\/li>
        2. var x = 10;  <\/li>
        3. var y = 20;  <\/li>
        4. var z=x+y;  <\/li>
        5. document.write(z);  <\/li>
        6. <\/<\/strong>script<\/strong>><\/strong>  <\/li><\/ol>\n\n\n\n

          Test it Now<\/a><\/p>\n\n\n\n

          Output of the above example<\/h4>\n\n\n\n

          30<\/p>\n\n\n\n

          \n\n\n\n

          JavaScript local variable<\/h2>\n\n\n\n

          A JavaScript local variable is declared inside block or function. It is accessible within the function or block only. For example:<\/a><\/a><\/a><\/p>\n\n\n\n

          1. <<\/strong>script<\/strong>><\/strong>  <\/li>
          2. function abc(){  <\/li>
          3. var x=10;\/\/local variable  <\/li>
          4. }  <\/li>
          5. <\/<\/strong>script<\/strong>><\/strong>  <\/li><\/ol>\n\n\n\n

            Or,<\/a><\/a><\/a><\/p>\n\n\n\n

            1. <<\/strong>script<\/strong>><\/strong>  <\/li>
            2. If(10<<\/strong>13<\/strong>){  <\/li>
            3. var y=20;\/\/JavaScript local variable  <\/li>
            4. }  <\/li>
            5. <\/<\/strong>script<\/strong>><\/strong>  <\/li><\/ol>\n\n\n\n
              \n\n\n\n

              JavaScript global variable<\/h2>\n\n\n\n

              A JavaScript global variable<\/strong> is accessible from any function. A variable i.e. declared outside the function or declared with window object is known as global variable. For example:<\/a><\/a><\/a><\/p>\n\n\n\n

              1. <<\/strong>script<\/strong>><\/strong>  <\/li>
              2. var data=200;\/\/gloabal variable  <\/li>
              3. function a(){  <\/li>
              4. document.writeln(data);  <\/li>
              5. }  <\/li>
              6. function b(){  <\/li>
              7. document.writeln(data);  <\/li>
              8. }  <\/li>
              9. a();\/\/calling JavaScript function  <\/li>
              10. b();  <\/li>
              11. <\/<\/strong>script<\/strong>><\/strong>  <\/li><\/ol>\n","protected":false},"excerpt":{"rendered":"

                A JavaScript variable is simply a name of storage location. There are two types of variables in JavaScript : local variable and global variable. There are some rules while declaring a JavaScript variable (also known as identifiers). Name must start with a letter (a to z or A to Z), underscore( _ ), or dollar( $ ) […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[429],"tags":[],"_links":{"self":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/2196"}],"collection":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/comments?post=2196"}],"version-history":[{"count":0,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/posts\/2196\/revisions"}],"wp:attachment":[{"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/media?parent=2196"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/categories?post=2196"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/mudassirbackup.infinitycodestudio.com\/index.php\/wp-json\/wp\/v2\/tags?post=2196"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}