Q631. What is the purpose of dir method of console object?
The `console.dir()` is used to display an interactive list of the properties of the specified JavaScript object as JSON. ```javascript const user = { name: "John", id: 1,...
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Q632. Is it possible to debug HTML elements in console?
Yes, it is possible to get and debug HTML elements in the console just like inspecting elements. ```javascript const element = document.getElementsByTagName("body")[0]; c...
Q633. How do you display data in a tabular format using console object?
The `console.table()` is used to display data in the console in a tabular format to visualize complex arrays or objects. ```js const users = [ { name: "John", id: 1, city...
Q634. How do you verify that an argument is a Number or not?
The combination of IsNaN and isFinite methods are used to confirm whether an argument is a number or not. ```javascript function isNumber(n) { return !isNaN(parseFloat(n)...
Q635. How you use decorators in React?
You can _decorate_ your _class_ components, which is the same as passing the component into a function. **Decorators** are flexible and readable way of modifying componen...
Q636. How do you create copy to clipboard button?
You need to select the content(using .select() method) of the input element and execute the copy command with execCommand (i.e, execCommand('copy')). You can also execute...
Q637. What is the shortcut to get timestamp?
You can use `new Date().getTime()` to get the current timestamp. There is an alternative shortcut to get the value. ```javascript console.log(+new Date()); console.log(Da...
Q638. How do you flattening multi dimensional arrays?
Flattening bi-dimensional arrays is trivial with Spread operator. ```javascript const biDimensionalArr = [11, [22, 33], [44, 55], [66, 77], 88, 99]; const flattenArr = []...
Q639. What is the easiest multi condition checking?
You can use `indexOf` to compare input with multiple values instead of checking each value as one condition. ```javascript // Verbose approach if ( input === "first" || i...
Q640. How do you capture browser back button?
The `beforeunload` event is triggered when the window, the document and its resources are about to be unloaded. This event is helpful to warn users about losing the curre...