Forms are an integral part of any website. Most websites often contain the Contact Us form. Forms collect the user information & send it to a server to store it in a database. In today’s post, we are going to learn how you can collect the user information via HTML forms & submit it to […]
The then() method returns a Promise. It takes up to two arguments: callback functions for the success and failure cases of the Promise. Promises can be chained one after the other using the .then() chain. The subsequent promises in .then chain are only executed once the current promise resolves successfully. If the current promise rejects […]
In this article, you will learn how to solve cannot set property ‘innerhtml’ of null error in JavaScript. Let’s look at a code example that produces the same error. Output In order to solve cannot set property ‘innerhtml’ of null error in JavaScript by moving our <script> below our paragraph like in the code snippet below: output
In this article, you will learn how to download a file in Javascript. Let’s say you want to download Codesource.io’s logo. Download File In order to download a file, you can use the HTML’s download attribute. Note: The HTML’s download attribute functions by downloading the supplied file URL upon clicking.
In this article, you will learn how to validate an email in Javascript. Validate Email In order to validate email, you can use the regular expression and test() method. Note: The regular expression is a sequence of characters used as a search pattern. The test() method functions by testing for a match in the supplied […]
In this article, you will learn how to check for array equality in Javascript. Let’s say you have 3 arrays. Check For Array Equality In order to check for array equality, you can use the Array.length property and Array.every() method. Note: The Array.length property functions by returning the length of the array. The Array.every() method […]
In this article, you will learn how to get a division remainder in Javascript. Let’s say you have 2 numbers. Get Division Remainder In order to get a division remainder, you can use the modulo operator, %. Note: The modulo operator, % functions by returning the remainder in an arithmetic division.
In this article, you will learn how to use spread operators in JavaScript. The spread operator basically allows iterable operations such as an array or object to be expanded in other places. Say we have two Arrays array1 and array2 We can use spread operators to merge the two arrays: Aside merging the two arrays […]
In this article, you will learn how to compare objects in lodash. Lodash is basically a JavaScript library that provides utility functions for functional programming. Comparing objects with lodash can be achieved using the _.isEqual method. Here’s how: This returns false if objects are different.
In this article, you will learn how to convert JavaScript Objects into Arrays. This we would achieve by using the following JavaScript object method; Object.keys(). This would throw us an array with these:
In this article, you will learn How to Implement Block scope in JavaScript. Block scope is a new ES6 feature. You create a new block scope for each set of curly braces. you use let and const keywords to add Variables to block scope. Implement Block scope in JavaScript Consider the example below: To implement block scope in JavaScript with […]
In this article, you will learn how to do case-insensitive string comparison in Javascript. Let’s say you have 2 string variables. In order to do case-insensitive string comparison, you can use the String.localeCompare() method. In this example, you will be doing a comparison between two strings using English as locale and sensitivity equals to base. […]
In this article, you will learn how to force a value conversion to boolean in Javascript. Let’s say you have 2 variables. In order to force a value conversion to boolean, you can use the double bang operator, !!. Note: The double bang operator, !! functions by returning the truthy value of its operand. The […]
In this article, you will learn how to format numbers as a currency string in Javascript. Let’s say you have a number variable ‘a’ with value 12345.60 In order to format numbers as a currency, you can use the Intl.NumberFormat()method. In this example, you will be formatting a number into a currency of type USD. […]
In this article, you will learn how to swap two values without a temporary variable in Javascript. Let’s say you have 2 variables. In order to swap two values without a temporary variable, you can use the ES6’s destructuring assignment. In this example, you will be swapping the values of variable ‘a’ with value of […]
