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ECMAScript Interview Questions and Answers
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Questions
ECMAScript
0
votes
Q: The bodies of class declarations and class expressions are executed in strict mode. (1)True (2)False
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: _________ feature helps us to simplify the inheritance concept.
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: Maps can be used to store __________.
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: Which is not true about static methods?
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: Which is not true about static methods?
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: Below is the extends class code class Player extends Student { constructor(roll, name) { super(roll, name); this.Player = true; } }; Here, super(roll,name); refers to the
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: What will be printed if the following code is executed? let x=150; if(x>100) { x=1; } console.log(x);
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: Which of the following statements is not true about level of scope?
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: Which of the following is not a state of Promise?
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: Variables declared with which of the following constructs do not have block scope?
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: What is the scope of the variable "a" in function below? function val(x){ if(x>0){ let a = x; console.log(a); } }
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: A Promise has _________ number of states.
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: What is the meaning of the following line of code? const pi=3.14;
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: Which of the following does not declare a block scoped variable?
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: What if promise2 get rejected in the following syntax? Promise.all(promise1, promise2, .....)
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: Keyword "let" allows redeclaring variables.
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: Objects declared as "const" are immutable.
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: Symbols can be created using the factory function _________.
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: What is the significance of the following code snippet? for (let i = 0; i < 10; i++) { x += 10; }
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: ES6 modules are stored in __________.
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: Using yield(), Generators can receive input from _________.
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: Declaring variables with which of the following keywords, will make the variable immutable?
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
+1
vote
Q: It is always a good practice to physically separate the code based on ________.
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: A JavaScript module is a file that exports something for other modules to consume.
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: ECMAScript is a __________
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: ES6 is officially called ______________
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: Which method can be used to retrieve symbols from the global symbols registry?
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: Promise reactions are callbacks that you register with the Promise method then(), to be notified of a fulfillment or a rejection.
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: In Arrow functions, if there is only one parameter and that parameter is an identifier then the parentheses can be omitted.
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
0
votes
Q: Which of the following parameters can be used to define indefinite number of parameters in one single array?
asked
Jan 21, 2020
in
ECMAScript
by
GeorgeBell
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