description

# operator []= method

void operator []=(

1. int index,
2. SpeechGrammar value

)
override

Sets the value at the given `index` in the list to `value`.

The `index` must be a valid index of this list, which means that `index` must be non-negative and less than length.

## Implementation

    void operator []=(int index, SpeechGrammar value) {
      throw new UnsupportedError("Cannot assign element of immutable List.");
    }