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We can create a Polygon object by creating an instance of fabric.Polygon. A polygon object can be characterized by any closed shape consisting of a set of connected straight line segments. Since it is one of the basic elements of FabricJS, we can also easily customize it by applying properties like angle, opacity etc. In order to identify if the given object is of a Polygon instance, we use the isType method. This method checks if the object is of the specified type and returns a true or false value depending on that. Syntax isType(type: String): ... Read More
To align a flexbox container to the center using JavaScript, you can manipulate the container's CSS properties through the DOM. This involves selecting the container element and applying flexbox properties to center its content horizontally and optionally vertically. Flexbox is a CSS3 layout mode that provides powerful alignment and distribution capabilities for elements on a page. It's particularly useful for creating responsive layouts, navigation bars, and galleries. Methods to Center Flexbox Content There are several approaches to center flexbox containers using JavaScript: Using justify-content: Centers items horizontally within the flex container by ... Read More
We need to write a JavaScript function that concatenates two strings with a smart approach. If the last character of the first string matches the first character of the second string, we omit one of those duplicate characters to avoid redundancy. Problem Statement When concatenating strings like "Food" and "dog", a simple join would give "Fooddog". However, since both strings share the character 'd' at the junction, smart concatenation removes the duplicate to produce "Foodog". Example Here's how to implement smart string concatenation: const str1 = 'Food'; const str2 = 'dog'; const concatenateStrings ... Read More
When working with arrays of arrays in JavaScript, you might need to group elements based on specific criteria. This article demonstrates how to group the second elements of subarrays that share the same first element. Problem Statement Suppose we have an array of arrays where each subarray contains exactly two elements: const arr = [[1, 45], [1, 34], [1, 49], [2, 34], [4, 78], [2, 67], [4, 65]]; console.log("Input array:", arr); Input array: [ [ 1, 45 ], [ 1, 34 ], [ 1, 49 ], [ 2, 34 ], [ 4, 78 ... Read More
When working with HTML tables, you often need to extract the ID from table rows and display them within the table itself. This tutorial shows how to get the ID from tags and add them as new table cells using JavaScript. Sample Table Structure Consider the following table with ID attributes on each row: StudentName StudentCountryName ... Read More
A Reverse Polish Notation (RPN) calculator processes operators after their operands, using a stack data structure. This implementation evaluates mathematical expressions efficiently without parentheses. How RPN Works In RPN, operators follow their operands. For example, "3 4 +" means "3 + 4". The algorithm uses a stack: Push operands onto the stack When encountering an operator, pop two operands, perform the operation, and push the result back The final stack contains the result Step-by-Step Process Consider the input array: const arr = [1, 5, '+', 6, 3, '-', '/', 7, '*']; ... Read More
We are required to write a JavaScript function that takes in a positive integer as the first and the only argument. The function should find one such smallest prime number which is just greater than the number specified as argument. For example − If the input is − const num = 18; Then the output should be: const output = 19; Understanding Prime Numbers A prime number is a natural number greater than 1 that has no positive divisors other than 1 and itself. To check if a ... Read More
When calculating compound interest over time, you may need to determine the exact date when your deposited money will reach a target amount. This problem involves daily compounding at a given annual interest rate. Problem Statement Given an initial deposit amount, a target amount, and an annual interest rate, we need to find the date when the deposited money (with daily compounding) will equal or exceed the target amount. The calculation starts from January 1st, 2021, with interest compounded daily at a rate of p percent divided by 360 days. Solution Approach The solution uses a ... Read More
Dynamic values are values assigned to variables whose names are determined at runtime rather than being hard-coded. In JavaScript, we can use dynamic property names in objects, allowing us to create flexible object structures where property names can be changed without modifying the object definition directly. Dynamic objects are particularly useful when you need to create properties based on variables, user input, or computed values. The key technique involves using square brackets [ ] syntax to define property names dynamically. Syntax Following is the syntax to create dynamic values and objects: const key = 'PropertyName'; ... Read More
We can create a Polygon object by creating an instance of fabric.Polygon. A polygon object can be characterized by any closed shape consisting of a set of connected straight line segments. Since it is one of the basic elements of FabricJS, we can also easily customize it by applying properties like angle, opacity etc. Syntax set(key: String, value: String | Boolean | Number | Object | Function) Parameters key − This parameter accepts a String which specifies the property we ... Read More