Web Reference: Built-in variables such as mouseX, mouseY, width, and height do not have to be declared because they are built into the p5.js library, and you can use them anywhere in your code because they have global scope! In the syntax of p5.js, we use var or let to declare variables. let is used for local scope, which means the variable can only be used in the same function where it is declared. For example, if the variable is declared under the function draw (), then it can only be used under the draw () function. There are other variables available for us in our p5.js sketches, like key, which holds the value of the last-pressed key on the keyboard, or, pixels, which is a variable that holds a list of color values, one for each pixel of our canvas.
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