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• Concatenate array in JavaScript, https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/concat.
• Example codes.

var array1 = [1, 2, 3];
var array2 = [4, 5, 6];
var array3 = array1.concat(array2);
// After that `array3` will be `[1, 2, 3, 4, 5, 6]`.

• There is func.apply() from object to fill func() with parameters.
• Here is the example codes that will print "hello world" in the console.

var args = ["hello", "world"];
function test (_arg1, _arg2) { console.log(_arg1 + " " + _arg2); }
test.apply(this, args);

• This is the reference for func.apply(), https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/apply.
• In P5JS use strokeWeight() to adjust stroke thickness. For example strokeWeight(10) will set the next shape as 10 pixels thick.
• In P5JS use cursor() to change the pointer type into browser (then operating system) cursor.
• For example the default is cursor(ARROW), but for shape intended as a button cursor(HAND) can be used.
• There are ARROW, CROSS, HAND, MOVE, TEXT, or WAIT. The parameter can be a path to an image as well to be used a custom cursor.
• Example of default mode rectangle shape with P5JS.

rect(0, 0, 10, 10); // The last two parameter are the width and height.
rect(0, 0, 10, 10, 10); // The last parameter is the radius of of rounded corners.
/* More specific rounded corners.
The last 4 parameters are: top - left, top - right, bottom - right, and then
bottom - left. */
rect(0, 0, 10, 10, 10, 10, 10, 10);

• I made general function to remove letters in a string.

function removeLetters (_string, _rmString, _all) {
  if (_all === undefined) _all = true;

  if (_all) return _string.split(_rmString).join("");
  else return _string.replace(_rmString, "");
}

• If _all is true then delete all occurrences of _rmString in _string.
• For example "asdasd".split("a").join("") will return "sdsd".
• If _all is false then delete one (the first) occurrences of _rmString in _string.
• For example "asdasd".replace("a", "") will return "sdasd".
• So this is actually more flexible than Python's str.replace().
• These are codes to remove n amount of letter from the end of string.

var str = "123asd";
str = str.substring(0, str.length - 3);

• The codes above will return "123".
• The - 3 can be adjusted to as to how many letter will be deleted from the end of string.
• In P5JS there is textWidth() to get the width of a text in pixels. The current configurations (font, size, ...) will be used as for the calculation. So, it is the best to have this inside a class or right after the text rendered into HTML5 <canvas>.
• Here is the reference for textWidth(), https://p5js.org/reference/#/p5/textWidth.
• Here are some example of dictionary usage in JavaScript.

var exmplDict = { text1:"hello", text2:"world" };

• In P5JS to convert keyCode (from keyPressed) into character can be done using String.fromCharCode(). Where the first argument is the keyboard button code itself. This is the StakOverflow reference, https://stackoverflow.com/questions/3977792/how-to-convert-keycode-to-character-using-javascript.
• In JavaScript, the keyup and keydown event cannot detect if a keyboard input returns capital letter or lower letter. However, the keyPressed event can detect case sensitive inputs. For reference, please refer to this StackOverflow discussion, https://stackoverflow.com/questions/14943966/javascript-string-fromcharcode-case-sensitivity.