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Jonathan Guerrero
Front End Web Development Techdegree Graduate 18,245 PointsI don't understand how to use the '[]' and when to use it.
Can somebody please explain this to me please? Thank You
2 Answers
Peter Vann
36,427 PointsHi Jonathan!
[] just initializes an empty array.
Like this:
let myArr = [];
And then you can add elements like this:
myArr.push('itemOne');
myArr.psuh('itemTwo');
myArr.push('itemThree');
You can also do it this way:
var myArr = new Array();
And there are pros/cons of each approach.
This explains in way more detail than I ever could:
I hope that helps.
Stay safe and happy coding!
Grace Marsh
Front End Web Development Techdegree Graduate 16,665 PointsHi Jonathan,
In addition to being used for arrays, I thought that perhaps this excerpt from a Treehouse question may assist you with how square brackets are used: Given this code:
function createElement( elementName, property, value ){
const element = document.createElement(elementName);
element[property] = value;
}
The brackets dynamically access the property of element using the string contained in property.
Jeff Muday
Treehouse Moderator 28,722 PointsJeff Muday
Treehouse Moderator 28,722 PointsThe '[]' connotes an empty list (or array) in JavaScript. It is usually used to initialize an array but can be used anytime you need to start a empty (blank) array or reset an list.
let myArray = [];