4.0 `attr` not support object as parameter

In 3.X, we can use syntax like:

  .attr({
    cx: d => d.x,
    cy: d => d.y,
    r: d => colorScale(d.value),
    fill: '#D0021B',
    opacity: 0.5,
  })

But now, it’s not work and no error prompt. Need change it to

.attr('cx', d=> d.x)
.......

What’s the reason the syntax changed?

Thanks in advance.

[saun4app]

@mbostock, would you please help us understand why d3-selection-multi is not recommended. Thank you.

[mbostock]

In D3 4.0, multi-value map support has moved to the d3-selection-multi repository as an optional plugin, using distinct names (e.g., selection.attrs instead of selection.attr) to avoid ambiguity.