Example:

const collection = new BufferPointCollection({primitiveCountMax: 1024});

const point = new BufferPoint();

// Create a new point, temporarily bound to 'point' local variable.
collection.add({
  position: new Cartesian3(0.0, 0.0, 0.0),
  color: Color.WHITE,
}, point);

// Iterate over all points in collection, temporarily binding 'point'
// local variable to each, and updating point color.
for (let i = 0; i < collection.primitiveCount; i++) {
  collection.get(i, point);
  point.setColor(Color.RED);
}

See:

• BufferPoint
• BufferPrimitiveCollection