I'm trying to get some understanding about new image. Would I be able to create a variable that is supposed to hold an image without assigning a new image object to it? I know you don't have to assign new array when creating an array or new object creating a new object. Is assigning new image to a variable that you are going to hold a image in an old method or do I still need to do it?
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2 Answers
There are shorthand examples for new Array() = [] and new Object() = {}, but there is no known shorthand/shortcut for new Image(). That is actually part of the HTML 5 spec, where this code comes from the W3C website:
image = new Image( [ width [, height ] ] )
Returns a new img element, with the width and height attributes set to the values passed in the relevant arguments, if applicable.
See the green box at this link (scroll up slightly): https://www.w3.org/TR/html5/embedded-content-0.html#dom-image
So every JS example on the web seems to be using new Image() in the code examples. However, you can use longhand, like this & assign properties to it.
var img = document.createElement('img');
img.src = '...';
img.height = 123;
img.width = 456;
It's not as cool as "()", because these keyboard pairs are already taken: [], {} and (). Those are for array, object & function parameters, respectively. This looks more like an HTML tag: <>. So there really isn't anything left on the keyboard, which could create a group for a shortcut / shorthand for new Image().
Here are a few JS shorthand links:
Comments
@Clomp does a good explanation. But here is another example on how to use this knowledge.
// Create new image element
var image = new Image( 100, 100 );
// Add an image source to element
image.src = 'http://www.publicdomainpictures.net/pictures/130000/velka/blue-tit-bird-clipart.jpg';
// Output new image element to console
console.log(image);
// Add image element to body
$('body').html(image);
