Codey's Counting Conundrum

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#1

When I was investigating the project, I found Math.floor(Math.random() * 5) * 90 + 25
and I understand the Math.floor(Math.random().
But why * 5) * 90 + 25?

what do these numbers indicate?

Thanks


// Helper function to return an object containing evenly spaced x and y coordinates:
  generateRandomCoords () {
    const randomX = Math.floor(Math.random() * 5) * 90 + 25
    const randomY = Math.floor(Math.random() * 5) * 100 + 25
    return { x: randomX, y: randomY }
  }

  // Helper function that returns one set of coordinates not in gameState.numCoordinates 
  assignCoords () {
    let assignedCoord = this.generateRandomCoords();

    // If the coordinates is already in gameState.numCoordinates, then other set of coordinates are generated until there is one not in use
    while (gameState.numCoordinates[`x${assignedCoord.x}y${assignedCoord.y}`]) {
      assignedCoord = this.generateRandomCoords()
    }

    gameState.numCoordinates[`x${assignedCoord.x}y${assignedCoord.y}`] = true

    return assignedCoord
  }
}
#2

It’s in steps. We floor *5 first, that gives us an integer {0,…,4]. The maximum for X is 385, a fixed number given the initial 4. The maximum for Y is 425. If you work backwards you’ll see only four other steps for each. And they are all fixed numbers.

#3

so the Width is 385

0* 90 = 0
1* 90 = 90
2* 90 = 180
3* 90 = 270
4* 90 = 360

25 is the margin of the bg, so the 5 rows move to right together for 25