Const can be changed if it is an object because when you're adding to an array or object you're not re-assigning or re-declaring the constant, it's already declared and assigned, you're just adding to the "list" that the constant points to. So this works fine:...
All objects in JavaScript descend from the parentObjectconstructor.Objecthas many useful built-in methods we can use and access to make working with individual objects straightforward. UnlikeArray prototype methodslikesort()andreverse()that are used on the array instance, Object methods are used direc...
Even though the object looks the same, we’re actually creating a new object{ name: 'Gera' }and trying to assign that new object toc3, but we can’t as it was declared as constant. Today I covered the topic of variable declarations and scoping in JavaScript. It’s a very important t...
Object and array in JavaScript are fundamental structures for storing and managing data. Efficiently adding elements to the beginning of an array in JavaScript is important for optimizing code performance, especially within the context of aJavaScript framework. Adding to array JavaScript allows dynamic d...
First, declare an array of objects, each object with an id and name properties. When it comes to the program’s execution, a function is created with an array, object key, and value. Theforloop is used to iterate through the objects in an array. Each object is checked with the assigne...
Instead, it uses arrows (combination of equals and greater than sign)=>to declare a function. This type of function was also introduced in the ES6 version of JavaScript. Here, we have created an empty object,obj. We will create an arrow function that takes an object as a parameter (entir...
In addition to the properties highlighted above, if the request was made and the server responded with a status code that falls outside the 2xx range, the error object will also have the error.response object. On the other hand, if the request was made but no response was received, the...
and they are read-only, which means we try to modify the target object. Read-only attribute, so it is reasonable to report an error. However, in non-strict mode, this behavior will only fail silently. In order for it to really throw an error, you must declare the use of strict mode...
other words, it is an instance of theFunctiontype. Consequently, it has properties and methods like other objects. Also, the name of a function is merely a pointer that points to the function object. Let's discuss in the below sections, how to declare and invoke functions in JavaScript. ...
In this example, theconsole.log(shark)is executed before thesharkvariable is declared, which results in the error. In general, it is good practice to declare your variables first before trying to access it. Note:Because of howletandconstdeclarations operate, the declarations are hoi...