Sometimes, we want to check if a JavaScript string is entirely made of the same substring. In this article, we’ll look at how to check if a JavaScript string is entirely made of the same substring. Use the String.prototype.indexOf Method We can use the indexOf method to return the index of the first instance…

Sometimes, we want to find the size of our browser’s local storage with JavaScript. In this article, we’ll look at how to find the size of our browser’s local storage with JavaScript. Convert to a Blob We can convert our browser’s local storage object into a blob to get the size of it. To…

Sometimes, we want to convert a JavaScript array into a string. In this article, we’ll look at how to convert a JavaScript array into a string. Concatenate a String to an Array One way to convert a JavaScript array into a string is to concatenate an empty string after it. For instance, we can write: const…

Sometimes, we want to calculate the day of the year with JavaScript. In this article, we’ll look at how to calculate the day of the year with JavaScript. Calculate the Day of the Year with JavaScript We can calculate the day of the year with JavaScript with some native date methods. For instance, we can write: const now…

Sometimes, we want to map the property values of a JavaScript object to another value while preserving the keys. In this article, we’ll look at how to map the property values of a JavaScript object to another value while preserving the keys. Lodash mapValues Method We can use the Lodash mapValues method to…

Sometimes, we want to join JavaScript strings together with a delimiter only if the strings aren’t null or empty. In this article, we’ll look at how to join JavaScript strings together with a delimiter only if the strings aren’t null or empty. Use the Array.prototype.filter Method We can use the JavaScript array filter method…

Sometimes, we want to define an HTML template and append it to our HTML document with jQuery. In this article, we’ll look at how to define an HTML template and append it to our HTML document with jQuery. Use the jQuery append Method We can use the jQuery append method with a script tag that…

Sometimes, we want to remove a file from a JavaScript FileList object. In this article, we’ll look at how to remove a file from a JavaScript FileList object. Use the Spread Operator One way to remove a file from a JavaScript FileList is to use the spread operator to convert the FileList to an…

Sometimes, we want to get the day of the week and the month of the year with JavaScript. In this article, we’ll look at how to get the day of the week and the month of the year with JavaScript. Get the Day of the Week To get the day of the week, we can use…