_co.slice is not a function

Question

I'm trying to display the failedjobs array<any> data in a reverse manner

<ion-item *ngFor="let failjob of failedjobs.slice().reverse()">

I'm getting an error as

ERROR TypeError: _co.failedjobs.slice is not a function at Object.eval [as updateDirectives] (FailedPage.html:13) at Object.debugUpdateDirectives [as updateDirectives] (core.js:14655) at checkAndUpdateView (core.js:13802) at callViewAction (core.js:14153) at execComponentViewsAction (core.js:14085) at checkAndUpdateView (core.js:13808) at callViewAction (core.js:14153) at execEmbeddedViewsAction (core.js:14111) at checkAndUpdateView (core.js:13803) at callViewAction (core.js:14153)

What is the problem & how do I resolve it.

Whatever `failedjobs` is (and we have no way of telling), it doesn't have a `slice` method. Why do you think it should? — Quentin, Dec 18 '18 at 13:40
You've tagged this [tag:ionic2] and [tag:ionic3] which are mutually exclusive. Which one are you using? — Quentin, Dec 18 '18 at 13:41
I'm using ionic 3. I have scene `.slice().reverse()` in some of the post of stackoverflow & I have tried it. Intailly it worked but now it's displaying as error @Quentin — raj_tx, Dec 18 '18 at 13:45

score -1 · Answer 1 · answered Dec 18 '18 at 13:38

-1

You can use the Slice pipe or use custom pipe instead of calling the function slice().reverse()

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({ name: 'reverse' })

export class ReversePipe implements PipeTransform {
  transform(value) {
    return value.slice().reverse();
  }
}

and consume as

<ion-item *ngFor="let failjob of failedjobs | reverse">

answered Dec 18 '18 at 13:38

Sajeetharan

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I'm getting error as `Uncaught Error: Template parse errors: The pipe 'reverse' could not be found (" ]ljob of failedjobs | reverse"> "):` – raj_tx Dec 18 '18 at 13:53
you need to register the pipe in your module – Sajeetharan Dec 18 '18 at 13:54
how do I do that? – raj_tx Dec 18 '18 at 13:55
https://stackoverflow.com/questions/42576420/how-to-declare-pipe-globally-to-use-in-different-modules – Sajeetharan Dec 18 '18 at 13:57
were you able to fix it – Sajeetharan Dec 18 '18 at 14:19

_co.slice is not a function

1 Answers1