Discussion on: The challenge to make a shape area calculation in CodeSignal

[Frederik 👨‍💻➡️🌐 Creemers]

I think think there's an even easier solution:

shapeArea = function(n){
    return 1 + (n-1)*4
}

[Xerghos]

I think this is more appropriate:

function shapeArea(n) {
return (1 + (n-1)*n) *2 - 1
}

[TrungSuSi97]

Why do you think that formula ?

[Axel Espinosa]

Did you solve it?

[Axel Espinosa]

Hey buddy, can you explain your solution?

[Camilo Martinez]

Yeah, that's exactly the beauty that I talk about code fights. You can learn from other solution.

[kikeflowers]

I found this solution and just replaced the variables

function shapeArea(n) {
return 1 + 2 * n * (n-1)
//1 + 2 * 4 * (3) = 3*4=12*2=24+1=25
//1 + 2 * 3 * (2) = 2*3=6*2=12+1=13
//1 + 2 * 2 * (1) = 1*2=2*2=4+1=5
//1 + 2 * 1 * (0) = 0*1*=0*2=0+1=1
}