37 + Interview Questions in ECMAScript in Tools Page 1 InterviewSolution

1.	Destructuring helps us to extract multiple values from an object via _
Answer» Destructuring helps US to extract MULTIPLE values from an object VIA __________. (1)Object PARAMETERS (2)Object Invocation (3)Object Pattern (4)Class instantiation Answer:-(3)Object Pattern

Discussion

2.	Arrow Functions are less verbose than traditional functions
Answer» ARROW FUNCTIONS are less verbose than traditional functions (1)False (2)TRUE Answer:-(2)True

Discussion

3.	Which is not a lexical inside arrow functions?
Answer» Which is not a lexical inside ARROW functions? (1)SUPER (2)this (3)new.target (4)None of the OPTIONS (5)arguments ANswer:-(4)None of the options

Discussion

4.	The bodies of class declarations and class expressions are executed in
Answer» The BODIES of class declarations and class expressions are executed in STRICT mode. (1)True (2)False Answer:-(1)True

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5.	What is the significance of the following code snippet?
Answer» What is the significance of the following code snippet? for (LET i = 0; i < 10; i++) { x += 10; } (1)"let I" is similar to "var i" (2)The variable i is valid only inside the for loop (3)all the options (4)The variable i is global. Answer:-(2)The variable i is valid only inside the for loop

Discussion

6.	Which keywords can be used to implement inheritance in ES6?
Answer» Which keywords can be used to implement INHERITANCE in ES6? (1)extends (2)DERIVES (3)inherits (4)implements Answer:-(1)extends

Discussion

7.	Using yield(), Generators can receive input from _________.
Answer» USING yield(), Generators can receive input from _________. (1)NEXT() (2)SET() (3)current() (4)list() Answer:-(1)next()

Discussion

8.	ES6 modules are stored in __________.
Answer» ES6 modules are STORED in __________. (1)files (2)Database (3)NONE of the OPTIONS (4)cloud Answer:-(1)files

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9.	Keyword "let" allows redeclaring variables.
Answer» Keyword "LET" allows redeclaring VARIABLES. (1)True (2)False Answer:-(2)False

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10.	Symbols can be created using the factory function _________.
Answer» SYMBOLS can be CREATED USING the factory function _________. (1)CreateSymbol() (2)InvokeSymbol() (3)SymbolFactory() (4)SYMBOL() Answer:-(4)Symbol()

Discussion

11.	Objects declared as "const" are immutable.
Answer» Objects DECLARED as "CONST" are IMMUTABLE. (1)False (2)True Answer:-(1)False

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12.	Template literals support ____________.
Answer» Template literals support ____________. (1)Raw data (2)INTERPOLATION (3)function calls (4)Restructuring Answer:-(2)interpolation

Discussion

13.	Template literals can be defined as _________.
Answer» Template literals can be DEFINED as _________. (1)HTML with blanks to be filled in (2)Template method arguments (3)multi-line STRING literals that support INTERPOLATION (4)function calls Answer:-(3)multi-line string literals that support interpolation

Discussion

14.	Template literals can be reused __________.
Answer» TEMPLATE LITERALS can be reused __________. (1)FALSE (2)True Answer:-(2)True

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15.	What will be the output of the following code snippet in ES6?
Answer» What will be the output of the following code SNIPPET in ES6? CONST func= ( x, y ) => { return x + y; }; func(11,12); (1)None of the options (2)Syntax Error (3)23 (4)Logical Error Answer:-(3)23

Discussion

16.	Variables declared in a scope are accessible in ___________.
Answer» Variables declared in a scope are ACCESSIBLE in ___________. (1)anywhere in the program (2)None of the OPTIONS (3)All scopes NESTED inside it (4)that scope only Answer:-(3)All scopes nested inside it

Discussion

17.	What will be the output of following code snippet?
Answer» What will be the output of following CODE snippet? function foo(a = 10, b = 5) { console.log(a, b); } foo(6); (1)10, 5 (2)10, 6 (3)undefined ERROR (4)6, 5 Answer:-(4)6, 5

Discussion

18.	Template literals does not allow us to _________.
Answer» Template literals does not allow US to _________. (1)build complex html and xml TEMPLATES. (2)create complex strings easily (3)Option I & II (4)evaluate an expression in templates (5)None of the OPTIONS Answer:-(5)None of the options

Discussion

19.	During destructuring, you can either declare variables or assign to th
Answer» During DESTRUCTURING, you can either DECLARE VARIABLES or assign to them, or both. (1)FALSE (2)True Answer:-(1)False

Discussion

20.	Check the Below code and check correct or not
Answer» CHECK the Below CODE and check correct or not const { x, y } = { x: 11, y: 8 }; is the Same as const { x: x, y: y } = { x: 11, y: 8 }; (1)TRUE (2)False Answer:-(1)True

Discussion

21.	The following code implements the ______ feature of ES6
Answer» The FOLLOWING code IMPLEMENTS the ______ feature of ES6 function myFunction(X, y, z) { } VAR args = [0, 1, 2]; myFunction(...args); (1)sets (2)spread (3)rest (4)maps Anwer:-(2)spread

Discussion

22.	"Rest" collects all variables into a single array, while "Spread" expands a single variable into multiple.
Answer» "REST" collects all variables into a SINGLE array, while "Spread" EXPANDS a single variable into multiple. (1)True (2)False Answer:-(1)True

Discussion

23.	All major JavaScript Implementations are based on which standard?
Answer» All major JavaScript IMPLEMENTATIONS are based on which STANDARD? (1)ECMA (2)ECMASCRIPT (3)Lava (4)CoffeeScript Answer:-(2)ECMAScript

Discussion

24.	In Arrow functions, if there is only one parameter and that parameter is an identifier then the parentheses can be omitted.
Answer» In Arrow functions, if there is only ONE parameter and that parameter is an IDENTIFIER then the parentheses can be OMITTED. (1)True (2)False Answer:-(1)True

Discussion

25.	Which of the following parameters can be used to define indefinite number of parameters in one single array?
Answer» Which of the following parameters can be used to DEFINE indefinite NUMBER of parameters in one SINGLE ARRAY? (1)DEFAULT (2)Rest (3)Spread Answer:-(2)Rest

Discussion

26.	Which of the following parameters can be used to expand a single array into multiple arguments?
Answer» Which of the following PARAMETERS can be USED to expand a single array into multiple arguments? (1)DEFAULT (2)SPREAD (3)Rest Answer:-(2)Spread

Discussion

27.	ES6 is the implementation of?
Answer» ES6 is the IMPLEMENTATION of? (1)ECMASCRIPT (2)JAVASCRIPT (3)ECMA2016 (4)ECMA Answer:-(1)ECMAScript

Discussion

28.	Promise reactions are callbacks that you register with the Promise method then(), to be notified of a fulfillment or a rejection.
Answer» Promise reactions are CALLBACKS that you REGISTER with the Promise method then(), to be NOTIFIED of a fulfillment or a rejection. (1)True (2)False Answer:-(1)True

Discussion

29.	ECMAScript is a __________
Answer» ECMASCRIPT is a __________ (1)Programming Standard (2)Pragramming LANGUAGE (3)Scripting Language (4)Language Standard Answer:-(4)Language Standard

Discussion

30.	ES6 can be used for ______________
Answer» ES6 can be USED for ______________ (1)It is used for UI design only (2)Only SERVER side SCRIPTING (3)Both client side and server side scription (4)Only client side scripting Answer:-(3)Both client side and server side scription

Discussion

31.	ES6 is officially called ______________
Answer» ES6 is officially called ______________ (1)ECMA SCRIPT 6 (2)ES 2016 (3)ECMA Script 2016 (4)ECMA Script 2015 Answer:-(4)ECMA Script 2015

Discussion

32.	What is the meaning of the following line of code?
Answer» What is the meaning of the following line of CODE? const pi=3.14; (1)It is exactly the same as var. (2)Const turns VARIABLES into constants, and they can t be CHANGED. (3)It is USED to define math-related variables (4)It is exactly the same as let. Answer:-(2)Const turns variables into constants, and they can t be changed.

Discussion

33.	Declaring variables with which of the following keywords, will make the variable immutable?
Answer» Declaring variables with which of the FOLLOWING keywords, will make the variable IMMUTABLE? (1)let (2)var (3)CONST Answer:-(3)const

Discussion

34.	A JavaScript module is a file that exports something for other modules to consume.
Answer» A JavaScript MODULE is a file that exports SOMETHING for other MODULES to consume. (1)False (2)TRUE Answer:-(2)True

Discussion

35.	Which method can be used to retrieve symbols from the global symbols registry?
Answer» Which METHOD can be used to retrieve symbols from the GLOBAL symbols REGISTRY? (1)SYMBOL.keyFor() (2)Symbol() (3)Symbol.for() (4)getSymbol() Answer:-(1)Symbol.keyFor()

Discussion

36.	It is always a good practice to physically separate the code based on ________.
Answer» It is always a good practice to PHYSICALLY separate the code based on ________. (1)FUNCTIONALITY (2)REQUIREMENT (3)All the options MENTIONED (4)Dependency Answer:-(1)Functionality

Discussion

37.	What if promise2 get rejected in the following syntax?
Answer» What if promise2 get rejected in the following syntax? Promise.all(promise1, promise2, .....) (1)It will accept Promise 1 and reject the REMAINING. (2)It will reject the entire set (3)It will Accept the entire set (4)It will OMIT Promise2 and Accept the remaining Answer:-(2)It will reject the entire set

Discussion

Explore topic-wise InterviewSolutions in .

Destructuring helps us to extract multiple values from an object via _

Arrow Functions are less verbose than traditional functions

Which is not a lexical inside arrow functions?

The bodies of class declarations and class expressions are executed in

What is the significance of the following code snippet?

Which keywords can be used to implement inheritance in ES6?

Using yield(), Generators can receive input from _________.

ES6 modules are stored in __________.

Keyword "let" allows redeclaring variables.

Symbols can be created using the factory function _________.

Objects declared as "const" are immutable.

Template literals support ____________.

Template literals can be defined as _________.

Template literals can be reused __________.

What will be the output of the following code snippet in ES6?

Variables declared in a scope are accessible in ___________.

What will be the output of following code snippet?

Template literals does not allow us to _________.

During destructuring, you can either declare variables or assign to th

Check the Below code and check correct or not

The following code implements the ______ feature of ES6

"Rest" collects all variables into a single array, while "Spread" expands a single variable into multiple.

All major JavaScript Implementations are based on which standard?

In Arrow functions, if there is only one parameter and that parameter is an identifier then the parentheses can be omitted.

Which of the following parameters can be used to define indefinite number of parameters in one single array?

Which of the following parameters can be used to expand a single array into multiple arguments?

ES6 is the implementation of?

Promise reactions are callbacks that you register with the Promise method then(), to be notified of a fulfillment or a rejection.

ECMAScript is a __________

ES6 can be used for ______________

ES6 is officially called ______________

What is the meaning of the following line of code?

Declaring variables with which of the following keywords, will make the variable immutable?

A JavaScript module is a file that exports something for other modules to consume.

Which method can be used to retrieve symbols from the global symbols registry?

It is always a good practice to physically separate the code based on ________.

What if promise2 get rejected in the following syntax?