Why is this JavaScript code with $ sign not working? -

html file

<div id="myid"></div> 

are these codes possible or not valid in javascript?

1.

function $(id) {     return document.getelementbyid(id); } 

2.

$("myid").innerhtml = "hello world"; 

below codes possible or not in javascript ?

the answer yes, code fine.

there nothing wrong code you've shown. many commenters have pointed out, works fine in js fiddle.

$ not, 1 commenter said, reserved word, see https://developer.mozilla.org/en-us/docs/web/javascript/reference/reserved_words

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however, recommend against using $ if code used others. $ used shortcut jquery, confusing commenters. believe (for readability) better off using different single character.