Web Reference: Sep 17, 2024 · In this article, we’ll explore what the constructor and ngOnInit are, their syntax, features, and uses and what is the difference between Constructor and ngOnInit. Mar 3, 2016 · The main difference between constructor and ngOnInit is that ngOnInit is lifecycle hook and runs after constructor. Component interpolated template and input initial values aren't available in constructor, but they are available in ngOnInit. Nov 21, 2025 · While they may seem interchangeable at first glance, they serve distinct purposes and are critical to writing robust Angular applications. This blog demystifies the differences between constructor and ngOnInit, explains when to use each, and highlights best practices to avoid common pitfalls.
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