JavaScript, being a loosely typed language, allows variables to hold any data type. This flexibility sometimes leads to situations where we need to verify the type of a variable, especially when dealing with numbers.JavaScript doesn’t have a built-in isNumber() function. So let’s explore all the possible alternatives we have. Best Solution: Using the typeof Operator…
JavaScript’s array.join() method is a powerhouse for transforming arrays into neatly combined strings. Whether you’re building shopping lists, generating comma-separated values (CSVs), or crafting compelling content listings, join() holds the key. But what exactly does it do, and how can you wield it like a pro? This post dives deep, exploring the ins and outs…
Unlike traditional for loops, JavaScript forEach loops don’t provide a built-in way to stop the iteration. So let’s explore all possible methods to break out of a forEach loop in JavaScript. Best Solution: Using .every() method The every() method is used to check whether or not all elements in an array pass the test implemented…
You’ve probably seen it lurking in the shadows of some JavaScript code snippets — but its cryptic nature may have left you scratching your head. In JavaScript, the double exclamation mark (!!) is a unary operator that converts the operand into its equivalent boolean value. It does this by first casting the operand to a…
In many programming languages, functions inherently return only one value. But what if you need to return more than one value? Fortunately, in JavaScript, there are several ways to achieve this, and in this comprehensive guide, we’re going to cover them all. Best Solution: Using Object Destructuring Object destructuring in JavaScript allows you to unpack…
JavaScript is a single-threaded language notorious for its non-blocking I/O model, doesn’t have a built-in sleep function like some other programming languages. However, there are multiple ways to introduce a delay or pause execution in JavaScript, each with its own pros and cons. Best Solution: Using Promises and async/await With the advent of ES6 (ECMAScript…
Best Solution: Using the in Operator The in operator was introduced in JavaScript specifically for this reason. It’s used to examine whether or not a property is present in a particular object or in its prototype chain. You can use the in operator is as follows: The code above will log “Yes, the object has…
In JavaScript, the division of numbers can be done using the division operator /. However, this will result in a floating-point number if the division isn’t exact. If you want to perform integer division, which discards the remainder and only returns the quotient, you have a couple of options. Best Solution: Math.trunc() The Math.trunc() function…
Best Solution: Object.assign() The Object.assign() method is the most straightforward way to merge objects in JavaScript. It copies the values (primitive and functions) and symbols from one or more source objects to a target object. It returns the target object. In this example, obj2 overwrites the property b in obj1 because Object.assign() merges objects from…
Best Solution: The startsWith() Method The simplest and most straightforward way to check if a string starts with another string in JavaScript is by using the built-in startsWith() method. Introduced in ES6, it returns a boolean value indicating whether or not the string begins with the characters of the specified string. In the example above,…
