" vs ' javascript code example

Example 1: javascript vs java

/*
JavaScript: Easier to learn and run, runs in browser,
not strictly object-orientated, mainly client-side.

Java: More secure, strict OOP, steeper learning curve, 
used literally everywhere, needs to be compiled.
*/

Example 2: type checking js vscode

//type checking all js files (vscode)  

//in settings.json:
 "javascript.implicitProjectConfig.checkJs": true

//also gives you ability to enable TypeScript features like auto-import on save

Example 3: vs code enable "html" in "javascript"

"emmet.includeLanguages": {
    "javascript": "javascriptreact",
    "vue-html": "html",
    "razor": "html",
    "plaintext": "pug"
}

Example 4: javascript !! vs !

// !! used for checking availability of data 
!!'hello' // true