Angular · Theory

Control Flow

← All stacks

Theory

27/43

Control Flow

If you can teach Control Flow using a Pass banner, you know it. If you only know the heading, you don’t.

Control Flow order — meaning → *ngIf="marks >= 40" → one limit. Dumping ten features helps nobody.

Skip Control Flow and *ngIf treating 0 as false shows up in a marks card.

Control Flow shows up in a marks card. Name a Pass banner, not “a real-world scenario”.

Don’t do this with Control Flow — *ngIf treating 0 as false. Interviewers spot it in ten seconds.

After Control Flow, Isha should still remember *ngIf treating 0 as false.

One breath for Control Flow, then a Pass banner, then *ngIf treating 0 as false. Sit down.

Exam tip

Say Control Flow in one breath, then *ngIf="marks >= 40", then *ngIf treating 0 as false.

Example

import { Component } from "@angular/core";

@Component({
  selector: "app-root",
  template: `
    <h1>{{ title }}</h1>
    <button (click)="toggle()">Toggle</button>
    <p *ngIf="open">Panel open</p>
  `,
})
export class AppComponent {
  title = "Angular practice";
  open = true;
  toggle() {
    this.open = !this.open;
  }
}

Control Flow: toggle open. Say whether the panel is on screen after one click.

Short notes

DefControl Flow — Isha uses it for a Pass banner in a marks card.
RuleControl Flow → *ngIf="marks >= 40".
RememberControl Flow + NgModule / standalone (a marks card).
UseControl Flow in a marks card (a Pass banner).
TrapControl Flow — *ngIf treating 0 as false.
ExControl Flow → a Pass banner.

import { Component } from "@angular/core"; @Component({ selector: "app-root", template: ` <h1>{{ title }}</h1> <button (click)="toggle()">Toggle</button> <p *ngIf="open">Panel open</p> `, }) export class AppComponent { title = "Angular practice"; open = true; toggle() { this.open = !this.open; } }

Control Flow

Example

Short notes

Questions

Control Flow

Example

Short notes

Questions