不知道是不是优雅的优雅

react开源库常用操作,我感觉这种写法挺优雅的,主要是之前经常被吐槽代码不够优雅,每天进步一点点,233

 let {a,b,c}=fn(){
   //一顿操作
   return {a,b,c}
 }
 //原例子如下

const { layoutCssVars, totalColumnWidth, totalFrozenColumnWidth, columnMetrics } = useMemo((): {
    layoutCssVars: Readonly<Record<string, string>>;
    totalColumnWidth: number;
    totalFrozenColumnWidth: number;
    columnMetrics: ReadonlyMap<CalculatedColumn<R, SR>, ColumnMetric>;
  } => {
    const columnMetrics = new Map<CalculatedColumn<R, SR>, ColumnMetric>();
    let left = 0;
    let totalColumnWidth = 0;
    let totalFrozenColumnWidth = 0;
    let templateColumns = '';
    let allocatedWidth = 0;
    let unassignedColumnsCount = 0;

    for (const column of columns) {
      let width = getSpecifiedWidth(column, columnWidths, viewportWidth);

      if (width === undefined) {
        unassignedColumnsCount++;
      } else {
        width = clampColumnWidth(width, column, minColumnWidth);
        allocatedWidth += width;
        columnMetrics.set(column, { width, left: 0 });
      }
    }

    const unallocatedWidth = viewportWidth - allocatedWidth;
    const unallocatedColumnWidth = unallocatedWidth / unassignedColumnsCount;

    for (const column of columns) {
      let width: number;
      if (columnMetrics.has(column)) {
        const columnMetric = columnMetrics.get(column)!;
        columnMetric.left = left;
        ({ width } = columnMetric);
      } else {
        width = clampColumnWidth(unallocatedColumnWidth, column, minColumnWidth);
        columnMetrics.set(column, { width, left });
      }
      totalColumnWidth += width;
      left += width;
      templateColumns += `${width}px `;
    }

    if (lastFrozenColumnIndex !== -1) {
      const columnMetric = columnMetrics.get(columns[lastFrozenColumnIndex])!;
      totalFrozenColumnWidth = columnMetric.left + columnMetric.width;
    }