javascript check if element has class
if(document.getElementById("myElmentID").classList.contains("hidden")){
// I have the 'hidden' class
}
javascript check if element has class
if(document.getElementById("myElmentID").classList.contains("hidden")){
// I have the 'hidden' class
}
js check if object has property
const object1 = new Object();
object1.property1 = 42;
console.log(object1.hasOwnProperty('property1'));
// expected output: true
check if js property exists in class
myObj.hasOwnProperty(myProp)
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