javascript on double click
document.getElementById("myBtn").addEventListener("dblclick", function() {
alert("Hello World!");
});javascript on double click
document.getElementById("myBtn").addEventListener("dblclick", function() {
alert("Hello World!");
});double question mark javascript
//Similar to || but only returns the right-hand operand if the left-hand is null or undefined
0 ?? "other" // 0
false ?? "other" // false
null ?? "other" // "other"
undefined ?? "other" // "other"javascript double exclamation mark
const isIE8 = !! navigator.userAgent.match(/MSIE 8.0/);
console.log(isIE8); // returns true or falsejavascript double exclamation mark
!oObject // inverted boolean
!!oObject // non inverted boolean so true boolean representationjavascript double exclamation mark
console.log(navigator.userAgent.match(/MSIE 8.0/));
// returns either an Array or nulljavascript double exclamation mark
console.log(!!navigator.userAgent.match(/MSIE 8.0/));
// returns either true or falseCopyright © 2021 Codeinu
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