Interview Questions and Answers for 'L' | Search Interview Question

Interview Questions and Answers - Order By Newest

Q2051. How do you version your projects ?

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Q2052. Can you please share best practices while designing an angular application ?

Angular

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Q2053. How can print the whole object state in the console in javascript ?

Javascript

Ans. We can JSON.stringify

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Q2054. Which one of AWS Lambda or API Gateway is a compute service ?

Amazon Web Services (AWS)

Ans. AWS Lambda

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Q2055. What is the difference between closing and completing the observer / listener ?

Angular

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Q2056. Have you ever faced problem because of some listener / observers / subscriber performing action on the subscription which you don't want ? How did you fix the problem ?

Angular

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Q2057. What is the difference between subscribe and emit ?

Angular

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Q2058. What is the difference between subscribe and unsubscribe ?

Angular

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Q2059. What is the difference between Subject and Observable ?

Angular

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Q2060. What does pipe does on an observable ?

RxJs

Ans. With pipe we specify the operator function to which this observable is passed for transforming the observable.

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Q2061. What do we specify within the pipe method ?

RxJs

Ans. Operator function to which an observable is passed for transformation.

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Q2062. Why do we do transformation on the observable itself rather than doing it in the subscriber ?

RxJs

Ans. Because that way we just need to do that transformation at one place and not within each subscriber. Single source of truth.

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Q2063. Can we specify multiple functions in the pipe ? What happens if we do it ?

RxJs

Ans. Yes, We can specify multiple functions within pipe method. In that case first function get's called with the observable , the response if then passed to the second method and so on.

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Q2064. Can we specify multiple maps within pipe ?

RxJs

Ans. Yes, it's same as passing multiple methods within pipe. Output of one map is passed to second and so on.

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Q2065. How can we sort an observable of a user array on user name ( name being one of the field of user ) ?

RxJs

Ans. userArrayObservable.pipe(
map(userArray => {
return userArray.sort(comparator);
});
)

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Q2066. Can we do a thread specific heap allocation ?

Memory Management

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Q2067. Do you ever merge changes from one feature branch to another ? Why ?

SCM

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Q2068. What does this warning message for the unit test means

WARN: 'Spec has no expectations.'

Angular

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Q2069. How can you trim all strings in an array ?

Ans. array.map(s => s.trim())

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Q2070. Can we get the validators for a control in angular ? How ?

Angular

Ans. No - https://github.com/angular/angular/issues/13461

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Q2071. How can we add a text in front of all input fields in an application ?

Angular

Ans. We can create a directive with selector as 'input' and then onInit of the directive , we can append the text to the input control html.

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Q2072. Can we have multiple selectors for a directive in Angular ?

Angular

Ans. Yes

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Q2073. What is the use of NgControl ?

Angular

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Q2074. What is the use of Renderer class in angular ?

Angular

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Q2075. What is the use of ElementRef in angular ?

Angular

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Q2076. How can we add a particular styling to a field based on a condition ?

Angular

Ans. We can create a directive to do that.

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Q2077. Can we have a directive that get's applied based on an attribute on a field ?

Angular

Ans. Yes

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Q2078. What would you use the span element for ?

HTML

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Q2079. What will be the output of following ?

String str1 = new String("String1");
String str2 = new String("String1");
System.out.print(str1 == str2);
System.out.print(str1.equals(str2));
str1 = str2;
System.out.print(str1 == str2);

Core Java

a. falsetruetrue

b. truetruetrue

c. truetruefalse

d. falsetruefalse

Ans.a. falsetruetrue

Q2080. What will be the output of following code ?

String str1 = "String1";
String str2 = "String1";
System.out.print(str1 == str2);
System.out.print(str1.equals(str2));
str1 = str2;
System.out.print(str1 == str2);

Core Java

a. falsetruetrue

b. falsefalsetrue

c. truetruetrue

d. falsefalsefalse

Ans.c. truetruetrue

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