Why is ng-bind Often Preferred Over {{}} in AngularJS for Performance Optimization?

Understanding the Performance Benefits of ng-bind vs. {{}} in AngularJS

When working with angular data binding, the choice between ng-bind and {{}} can significantly impact performance. Let's delve into the nuances of each method to determine why ng-bind is often recommended and when {{}} should be used.

Visibility and Performance

ng-bind is a directive that initializes a watch on its assigned value. Therefore, it only updates the view when the value actually changes. In contrast, {{}} performs interpolation at every digest cycle, regardless of whether the value has changed. This interpolation can introduce unnecessary overhead, especially in applications with a large number of bindings.

Visible Brackets

While ng-bind avoids visible brackets during bootstrapping, {{}} can cause them to appear prior to data binding. This can be mitigated by using ng-cloak, but it requires additional steps.

Performance Considerations

Empirically, replacing {{}} with ng-bind has been shown to enhance performance by approximately 20%. Since ng-bind only updates the view when the value changes, it significantly reduces unnecessary rendering.

Suggestions for Optimized Binding

To improve performance, consider the following strategies:

• Prefer directives (like ng-translate and custom filter directives) over brackets annotation whenever possible.
• Use ng-bind rather than {{}} for data that changes infrequently.
• Explore bindonce in Angular 1.3x to limit unnecessary bindings.

By understanding the advantages of ng-bind over {{}} in AngularJS, developers can optimize their applications' performance and enhance user experience.

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