Cognizant Angular Frontend Developer Interview Questions, Process, and Tips

Challenges faced during Angular migration, creating reducers in ngrx, flattening arrays, and sorting.

• Challenges during migration: compatibility issues, deprecated features, breaking changes.

• Creating reducers in ngrx: define actions, create reducer function, update state immutably.

• Flattening arrays: use flat() method, recursion, or spread operator.

• Sorting arrays: use sort() method with custom comparator function.

Pipes in Angular are used for transforming data in templates.

• Pipes are used to format data before displaying it in the view.

• Angular provides built-in pipes like DatePipe, UpperCasePipe, LowerCasePipe, etc.

• Custom pipes can also be created for specific formatting needs.

• Pipes can be chained together for complex transformations.

• Example: {{ birthday | date:'dd/MM/yyyy' }} will format the birthday date.

Closure in JavaScript allows a function to access variables from its outer scope even after the function has finished executing.

• Closure is created when a function is defined within another function and the inner function references variables from the outer function.

• The inner function maintains a reference to the outer function's scope even after the outer function has finished executing.

• Closures are commonly used in ev...read more

A directive in Angular is a class with a @Directive decorator that allows you to attach behavior to elements in the DOM.

• Directives are used to manipulate the DOM in Angular applications.

• There are three types of directives in Angular: component, structural, and attribute directives.

• Examples of directives include ngIf, ngFor, and ngStyle.