code: function _generateInterpolatedColor() {
    const randIndicies = _getNextColorPair();
    const fraction = Math.random();
    const interpolatedColor = [];
  
    for (let i = 0; i < 4; i++) {
      interpolatedColor.push(
        Math.floor(
          fraction * distinctColors[randIndicies[0]][i] +
            (1.0 - fraction) * distinctColors[randIndicies[1]][i]
        )
      );
    }
  
    return interpolatedColor;
  }
docs: _generateInterpolatedColor -  generates a color interpolated between two
  colors. Humans can only distinguish between
  ~15-20 colors, so this is the best we can do.
  @private
  
  @returns {type}  description