BlogPost_204

William Kiyola
May 25 · 2 min read

-Describe one thing you’re learning in class today.

I learned on how to manipulate objects. Few methods used include .splice(), .concat(), and .map().

-Can you describe the main difference between a forEach loop and a .map() loop and why you would pick one versus the other?

The main difference is that .map() utilizes return values and actually returns a new Array of the same size while forEach does not.

-Describe event bubbling.

Event bubbling means exactly what it states. It occurs when a user interacts with a nested element and the event propagates through all of the ancestor elements. Its like a timeline or order of how elements are accessed during user interaction. For example, when a user clicks the button the event first fires on the button itself, then “bubbles” up to the parent div, and then up to the ancestor div.

-What is the definition of a higher-order function?

Its basically a “super-hero” function. It can take another function as an argument, or can return a function as a result.

  1. ES6 Template Literals offer a lot of flexibility in generating strings, can you give an example?

Template Literals are a new ES6 feature that allows us to work with strings in a novel way compared to ES5 and below. For example we can just use backticks instead of single or double quotes: const a_string = `something`

-What Is an Associative Array in JavaScript?

They are objects that are turned into objects. The user redefines as needed. When you assign values ​​to keys in a variable of ‘typeArray’, the array is transformed into an object, and it loses the attributes and methods of Array.

-What is array?

It is an object that lets you store multiple values in a single variable.

-Why Never Use New Array in JavaScript?

Because it may cause conflict. Its best practice to stick to [] when using arrays.