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Q3411. How can you trim all strings in an array ?

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

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Q3412. Is it safe to use session storage ?

Javascript

Ans. Session storage can be accessed from XSS (Cross site Scripting) attacks but cookies (if set with "HttpOnly" and "Secure" flags) are more safer against these attacks.

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Q3413. Can we specify that a particular variable may have either of the two data types in Typescript ?

Typescript

Ans. let result: string | boolean;

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Q3414. How can we specify that a particular variable may have either of the two data types in Typescript ?

Typescript

Ans. Yes

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Q3415. How can we specify that a particular variable may have either of the two data types in Typescript ?

Typescript

Ans. let result: string | boolean;

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Q3416. What does the following declaration mean

let result: string | number;

Typescript

Ans. It means we can assign either a string or a number to result.

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Q3417. Will the following code give any error

let result: string | number;
result = true;

Typescript

Ans. Yes, result can either be string or a number but not boolean.

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Q3418. Will the following code give any error

let result: string | number;
result = 'true';

Typescript

Ans. No

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Q3419. Will the following code give any error

let result: string | number;
result = 'true';

Typescript

Ans. No

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Q3420. Will the following code give any error

let result: boolean;
result = false | true;

Typescript

Ans. Yes, | is a bitwise operator and not boolean or. Use || instead

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Q3421. Will this code give any error ?

let result: boolean;
result = false || true;

Typescript

Ans. No

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Q3422. Will this code give any error ?

let result: boolean | string;
result = false || 'true';

Typescript

Ans. No

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Q3423. Will this code give any error ?

let result: string;
result = false || 'true';

Typescript

Ans. No

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Q3424. 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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Q3425. 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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Q3426. Can we have multiple selectors for a directive in Angular ?

Angular

Ans. Yes

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Q3427. What is the use of NgControl ?

Angular

^{This question is still unanswered. Can you please provide an answer.}

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Q3428. What is the use of Renderer class in angular ?

Angular

^{This question is still unanswered. Can you please provide an answer.}

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Q3429. What is the use of ElementRef in angular ?

Angular

^{This question is still unanswered. Can you please provide an answer.}

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Q3430. 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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Q3431. Can we have a directive that get's applied based on an attribute on a field ?

Angular

Ans. Yes

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Q3432. Can we initialize final fields within the constructor ? Why ?

Core Java

Ans. Yes, Because final fields needs to be initialized before the construction of the object completes. Not necessarily at the time of class loading.

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Q3433. What is systemd in Unix ?

Unix

^{This question was recently asked at 'Broadcom, Symantec'.This question is still unanswered. Can you please provide an answer.}

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Q3434. What is Array.Map function ? What will be output of following ?

const myArray = [1, 4, 9, 16];
const result = myArray.map(x => x * 2);

Javascript

Ans. It will create an array with each value as x*2

[2, 8, 18, 32]

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Q3435. What would you use the span element for ?

HTML

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Q3436. When String literals are compared using ==, they always returns true if the string values are same because .. Reference

Core Java

a. of overridden compareTo method

b. of overridden compare method

c. of String Pool

d. == means that the object contents are equal

Ans.c. of String Pool

Q3437. Which of the following is true ?

Core Java

a. Composition is Tightly Bound

b. Inheritance is Tightly Bound

c. Object can only hold reference of only one other object

d. A Class cannot be extended by multiple classes

Ans.b. Inheritance is Tightly Bound

Q3438. In case of String Literals .. Reference

Core Java

a. x==y on all literals always returns false

b. x.equals(y) on all literals always returns false

c. if x.equals(y) returns true, x==y returns true too

d. if x.equals(y) returns false, x==y returns true

Ans.c. if x.equals(y) returns true, x==y returns true too

Q3439. What is a default constructor ? Reference

Core Java

a. Constructor without parameters declared by user

b. Constructor provided by Java if no constructor is declared

c. Constructor with empty body

d. All of the above

Ans.b. Constructor provided by Java if no constructor is declared

Q3440. How can we create objects if we make the constructor private ?

Core Java

a. We can't create objects if constructor is private

b. We can only create objects if we follow singleton pattern

c. We can only create one object

d. We can create new object through static method or static block

Ans.d. We can create new object through static method or static block

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