javascript double exclamation mark

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showing results for - "javascript double exclamation mark"
Thiago
28 Mar 2018
1document.getElementById("myBtn").addEventListener("dblclick", function() {
2  alert("Hello World!");
3});
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Mathilde
15 Jun 2016
1let a = null;
2const b = a ?? -1;		// Same as b = ( a != null ? a : -1 );
3console.log(b);		  	// output: -1
4//OR IF
5let a = 9;
6const b = a ?? -1;
7console.log(b);  		// output: 9
8
9//PS.,VERY CLOSE TO '||' OPERATION IN FUNCTION, BY NOT THE SAME
source
Maria José
02 Aug 2020
1console.log(!!navigator.userAgent.match(/MSIE 8.0/));  
2// returns either true or false
3
Lorenzo
14 Sep 2018
1console.log(navigator.userAgent.match(/MSIE 8.0/));  
2// returns either an Array or null  
3
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