Writing a custom JavaScript transition using the tick function

The custom transition we will attempt to write in this section is a flipboard transition. The transition emulates the mechanics of vintage airport departure boards. During this transition, each letter of the text flips, cycling through characters until it finally lands on the correct one. The transition ends when all the letters have settled into the right character.

The following diagram illustrates how the flipboard transition works to reveal the phrase Hello Svelte, with the vertical axis representing the flow of time from top to bottom:

igure 14.8: Flipboard transition visualized

At the onset of the transition, letters begin to appear from left to right, starting as a dash (-) and then flipping through random characters before settling on the correct one. This flipping motion continues from left to right until all letters have aligned with their corresponding characters, unveiling the intended phrase.

The...