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{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"feat(compiler): Support instanceof operator in Built-in control flow (Angular templates)","articleBody":"### Which @angular/* package(s) are relevant/related to the feature request?\n\ncompiler\n\n### Description\n\nI'm interested in hearing opinions on allowing the use of the instanceof operator within the @if control block. Sometimes, I want to expose a template based on the instance of an object rather than its properties. \n\nWhile Angular templates is designed with a declarative UI composition in mind, I wonder if instanceof might not be considered declarative enough. If there is any reason for not considering it, could it be related to performance or debugging concerns?\n\nExample:\n\n```html\n@if(myObject instanceof SomeClass) {\n    \u003c!-- This template will only be displayed if myObject is an instance of SomeClass --\u003e\n    \u003cdiv class='some'\u003e\n         Content for SomeClass instance.\n    \u003c/div\u003e\n}\n\n```\n\n### Proposed solution\n\nHere is a [stackblitz](https://stackblitz.com/edit/ngifin-fcj1cnex?file=src%2Fapp%2Fapp.component.html)\n\n### Alternatives considered\n\nPre-Computed Properties: Compute the instanceof result in the component and bind it to the template.\nCustom Pipe: Use a custom pipe to encapsulate the instanceof logic.\nCustom Structural Directive: Create a directive to handle the instanceof check declaratively.","author":{"url":"https://github.com/sunio00000","@type":"Person","name":"sunio00000"},"datePublished":"2025-02-17T09:40:31.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":12},"url":"https://github.com/59975/angular/issues/59975"}