Anil Singh | Code-sample.com

Let’s see the example, // Opera 8.0+ var isOpera = (!! window . opr && !! opr . addons ) || !! window . opera || navigator . userAgent . indexOf ( ' OPR/' ) >= 0 ; // Firefox 1.0+ var isFirefox = typeof InstallTrigger !== 'undefined' ; // Safari 3.0+ "[object HTMLElementConstructor]" var isSafari = /constructor/ i . test ( window . HTMLElement ) || ( function ( p ) { return p . toString () === "[object SafariRemoteNotification]" ; })(! window [ 'safari' ] || ( typeof safari !== 'undefined' && safari . pushNotification )); // Internet Explorer 6-11 var isIE = /*@cc_on!@*/ false || !! document . documentMode ; // Edge 20+ var isEdge = ! isIE && !! window . StyleMedia ; // Chrome 1 - 71 var isChrome = !! window . chrome && (!! window . chrome . webstore || !! window . chrome . runtime ); // Blink engine detection var isBlink = ( isChr...

What is the difference between let, var, and const? In this article, I’m explaining the importance of these three keywords in JavaScript and TypeScript .   I also provided various examples to deeply understand and use them and what happened when? Let see about: V ar vs. Let vs. Const var : - 1.       var is function-scoped 2.       var return undefined when accessing a variable before it's declared let : - 1.       let is block-scoped 2.       let throw ReferenceError when accessing a variable before it's declared const :- 1.       Const is block-scoped 2.       Const throw ReferenceError when accessing a variable before it's declared 3.       Const cannot be reassigned Let see the Examples to understand what happens when - What will happen when the following ...