void operator []=(
Object object,
T value
)

Sets the value of this Expando's property on the given object. Properties can effectively be removed again by setting their value to null.

The object must not be a number, a string, a boolean or null.

Source

/**
 * Sets the value of this [Expando]'s property on the given
 * object. Properties can effectively be removed again by setting
 * their value to null.
 *
 * The object must not be a number, a string, a boolean or null.
 */
external void operator []=(Object object, T value);