嵌套循环在Angular TypeScript中未返回值。

huangapple
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英文:

Nested loop is not returning value in Angular TypeScript

问题

  1. 私有函数checkDeliveryNotesQuantity(line: SaleLine): Observable<boolean> {
  2.   return this.posSalesTableFacade.getStoreSaleBlockList$().pipe(
  3.     map((saleBlockList: SaleBlock[]) => {
  4.       saleBlockList.map(saleBlock => {
  5.         saleBlock.saleLineList.map(saleLineList => {
  6.           console.log('saleLineList', saleLineList);
  7.           return (
  8.             saleLineList.deliveryNotes &&
  9.             saleLineList.deliveryNotes.findIndex(
  10.               item => item.articleId === line.code && item.quantity >= line.missingQuantity
  11.             ) >= 0
  12.           );
  13.         });
  14.       });
  15.       return false;
  16.     })
  17.   );
  18. }
英文:

I have a nested loop in a function but it is returning the default value which is false, and not returning the value calculated inside the loop. Please let me know what I am doing wrong.

My code is given below. Thank you

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-js -->

  1.      private checkDeliveryNotesQuantity(line: SaleLine): Observable&lt;boolean&gt; {
  2.         return this.posSalesTableFacade.getStoreSaleBlockList$().pipe(
  3.           map((saleBlockList: SaleBlock[]) =&gt; {
  4.             saleBlockList.map(saleBlock =&gt; {
  5.               saleBlock.saleLineList.map(saleLineList =&gt; {
  6.                 console.log(&#39;saleLineList&#39;, saleLineList);
  7.                 return (
  8.                   saleLineList.deliveryNotes &amp;&amp;
  9.                   saleLineList.deliveryNotes.findIndex(
  10.                     item =&gt; item.articleId === line.code &amp;&amp; item.quantity &gt;= line.missingQuantity
  11.                   ) &gt;= 0
  12.                 );
  13.               });
  14.             });
  15.             return false;
  16.           })
  17.         );
  18.       }

<!-- end snippet -->

答案1

得分: 1

以下是您要翻译的内容：

原始代码部分：

  1. private checkDeliveryNotesQuantity(line: SaleLine): Observable<boolean> {
  2.     return this.posSalesTableFacade.getStoreSaleBlockList$().pipe(
  3.       map((saleBlockList: SaleBlock[]) => {
  4.         return saleBlockList.map(saleBlock => {
  5.           return saleBlock.saleLineList.map(saleLineList => {
  6.             console.log('saleLineList', saleLineList);
  7.             return (
  8.               saleLineList.deliveryNotes &&
  9.               saleLineList.deliveryNotes.findIndex(
  10.                 item => item.articleId === line.code && item.quantity >= line.missingQuantity
  11.               ) >= 0
  12.             );
  13.           });
  14.         });
  15.       })
  16.     );
  17.   }

建议修复部分：

  1. private checkDeliveryNotesQuantity(line: SaleLine): Observable<boolean> {
  2.     return this.posSalesTableFacade.getStoreSaleBlockList$().pipe(
  3.       map((saleBlockList: SaleBlock[]) => {
  4.         return saleBlockList.some(saleBlock => {
  5.           return saleBlock.saleLineList.some(saleLineList => {
  6.             console.log('saleLineList', saleLineList);
  7.             return (
  8.               saleLineList.deliveryNotes &&
  9.               saleLineList.deliveryNotes.findIndex(
  10.                 item => item.articleId === line.code && item.quantity >= line.missingQuantity
  11.               ) >= 0
  12.             );
  13.           });
  14.         });
  15.       })
  16.     );
  17.   }

请注意，修复后的 Observable 类型将为布尔类型。

英文:

Nested map lacks return:

  1.  private checkDeliveryNotesQuantity(line: SaleLine): Observable&lt;boolean&gt; {
  2.         return this.posSalesTableFacade.getStoreSaleBlockList$().pipe(
  3.           map((saleBlockList: SaleBlock[]) =&gt; {
  4.             return saleBlockList.map(saleBlock =&gt; {
  5.               return saleBlock.saleLineList.map(saleLineList =&gt; {
  6.                 console.log(&#39;saleLineList&#39;, saleLineList);
  7.                 return (
  8.                   saleLineList.deliveryNotes &amp;&amp;
  9.                   saleLineList.deliveryNotes.findIndex(
  10.                     item =&gt; item.articleId === line.code &amp;&amp; item.quantity &gt;= line.missingQuantity
  11.                   ) &gt;= 0
  12.                 );
  13.               });
  14.             });
  15.           })
  16.         );
  17.       }

Note, that the resulting Observable is going to be of type Array.

In order to fix that you should switch from map to some

  1. private checkDeliveryNotesQuantity(line: SaleLine): Observable&lt;boolean&gt; {
  2.         return this.posSalesTableFacade.getStoreSaleBlockList$().pipe(
  3.           map((saleBlockList: SaleBlock[]) =&gt; {
  4.             return saleBlockList.some(saleBlock =&gt; {
  5.               return saleBlock.saleLineList.some(saleLineList =&gt; {
  6.                 console.log(&#39;saleLineList&#39;, saleLineList);
  7.                 return (
  8.                   saleLineList.deliveryNotes &amp;&amp;
  9.                   saleLineList.deliveryNotes.findIndex(
  10.                     item =&gt; item.articleId === line.code &amp;&amp; item.quantity &gt;= line.missingQuantity
  11.                   ) &gt;= 0
  12.                 );
  13.               });
  14.             });
  15.           })
  16.         );
  17.       }

huangapple
  • 本文由 发表于 2023年5月10日 23:05:35
  • 转载请务必保留本文链接：https://go.coder-hub.com/76220015.html
  • angular
  • javascript
  • typescript
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