Method _doProgress

src/core/task.ts:258–270

(
        progress: TaskProgressCallback<Ctx>,
        start: number,
        end: number,
        modBy: number,
        modDataCount: number
    )

    }

    private _doProgress(
        progress: TaskProgressCallback<Ctx>,
        start: number,
        end: number,
        modBy: number,
        modDataCount: number
    ): void {
        iterator.reset(start, end, modBy, modDataCount);
        this._callingProgress = progress;
        this._callingProgress({
            start: start, end: end, count: end - start, next: iterator.next
        }, this.context);
    }

    private _doReset(skip: boolean): boolean {
        this._dueIndex = this._outputDueEnd = this._dueEnd = 0;