What is the difference between .call() and .apply()?
The function .call() and .apply() are very similar in their usage except a little difference. .call() is used when the number of the function’s arguments are known to the programmer,…
What are the important properties of an anonymous function in JavaScript?
A function that is declared without any named identifier is known as an anonymous function. In general, an anonymous function is inaccessible after its declaration. Anonymous function declaration – var…
What is for-in loop in Javascript?
The for-in loop is used to loop through the properties of an object. The syntax for the for-in loop is – for (variable name in object){ statement or block to…
How can a value be appended to an array?
A value can be appended to an array in the given manner – arr = value;
How closures work in JavaScript?
The closure is a locally declared variable related to a function that stays in memory when it has returned. For example: function greet(message) { console.log(message); } function greeter(name, age) {…
What is a window.onload and onDocumentReady?
The onload function is not run until all the information on the page is loaded. This leads to a substantial delay before any code is executed. onDocumentReady loads the code…
How can the OS of the client machine be detected?
The navigator. appVersion string can be used to detect the operating system on the client machine.
What is the way to get the status of a CheckBox?
The status can be acquired as follows – alert(document.getElementById('checkbox1').checked); If the CheckBox is checked, this alert will return TRUE.
What is the ‘Strict Mode in JavaScript, and how can it be enabled?
Strict Mode adds certain compulsions to JavaScript. Under the strict Mode, JavaScript shows errors for a piece of code, which did not show an error before, but might be problematic…
How are object properties assigned?
Properties are assigned to objects in the following way – obj = 12; or obj.class = 12;