Use PipeTransform to apply multiple filters simultaneously

Is it possible to apply multiple filters with PipeTransform?

I attempted the following:

 posts;
  postss;
    transform(items: any[]): any[] {
             if (items && items.length)
             this.posts = items.filter(it => it.library = it.library.replace("WH","Warehouse"));
             this.postss = items.filter(it => it.collection = it.collection.replace("CL","Central Library"));                                                        

             return this.posts,this.postss;
         }

Unfortunately, this approach did not yield the desired results.

However,

posts; 
transform(items: any[]): any[] {
                 if (items && items.length)
                 this.posts = items.filter(it => it.library = it.library.replace("WH","Warehouse"));
return this.posts;
             }

this alternative method proved to be successful.

javascriptangulartypescriptionic-frameworkionic2

Answer №1

When it comes to modifying each element in the items array, using forEach instead of filter is more suitable. Implement your changes within the forEach loop like this:


         transform(items: any[]): any[] {
             if (items && items.length){
                 items.forEach((it,index,array) => {
                   array[index].library = it.library.replace("WH","Warehouse"); 
                   array[index].collection = it.collection.replace("CL","Central Library");
                 });                                                        
             }
             return items ;
         }

Answer №2

function mergePosts() {
    return this.posts.concat(this.postss);
}

According to the documentation found at concat:

The concat() function creates a new array that combines the elements of the original array with the specified arrays or values.

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