addSlice method Null safety

void addSlice (
  1. String chunk,
  2. int start,
  3. int end,
  4. bool isLast
)

Adds the next chunk to this.

Adds the substring defined by start and end-exclusive to this.

If isLast is true closes this.

Implementation

void addSlice(String chunk, int start, int end, bool isLast);