Evalscript trouble when returning 3 dimensional array

While trying to customize NDVI coloring, we got a trouble not to visualize accurately as returned from evaluatePixcel function. When simplified as follows, we finally found a specific point that might bring a problem. When returned code[0] from evaluatePixel(), the preview becomes a perfect yellow; however, code[1] brings absolute white. There is only a little difference between 2 arrays. Why is this happened on code[1]? How could we get a correct color from code[1]?

We are in great trouble for this. What we need is to make a precise customization according to NDVI value from B04 and B08. Thank you for the quick help.

//VERSION=3

function evaluatePixel(samples) {

let code = [[255,255,0], [255,255,1]];

return code[0];

}

function setup() {

return {

input: [{

bands: [

“B04”,

“B08”

]

}],

output: {

bands: 3

}

}

}

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Specify also the appropriate sampleType of the output. For pngs that would be UINT8 (values ranging from 0 to 255).

//VERSION=3



function evaluatePixel(samples) {

let code = [[255,255,0], [255,255,1]];

return code[0];

}



function evaluatePixel(samples) {

  let code = [[255,255,0], [255,255,1]];

  return code[1]

}



function setup() {

  return {

    input: [{

      bands: [

        "B04",

        "B08"

      ]

    }],

    output: {

      bands: 3,

      sampleType: SampleType.UINT8

    }

  }

}