continuous.rangeRound()

continuous.rangeRound([range])

Sets the scale’s range to the specified array of values while also setting the scale’s interpolator to interpolateRound. This is a convenience method equivalent to:

continuous
    .range(range)
    .interpolate(d3.interpolateRound);

The rounding interpolator is sometimes useful for avoiding antialiasing artifacts, though also consider the shape-rendering “crispEdges” styles. Note that this interpolator can only be used with numeric ranges.