template-use-track-by-function.md

Pattern: Missing use of trackBy

Issue: -

Description

The use of trackBy is considered a good practice.

To avoid expensive operations, you can customize the default tracking algorithm by supplying the trackBy option to NgForOf. trackBy takes a function that has two arguments: index and item. If trackBy is given, Angular tracks changes by the return value of the function.

Further Reading

• TSLint - template-use-track-by-function