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1. const shape = { radius: 10, diameter() { return this.radius * 2; }, perimeter: () => 2 * Math.PI * this.radius, }; console.log(shape.diameter());// console.log(shape.perimeter());//
20 NaN 
let obj = { x: 2, getX: function() { setTimeout(() => console.log('a'), 0);// new Promise( res => res(1)).then(v => console.log(v));// setTimeout(() => console.log('b'), 0);// } } obj.getX();

o/p :- promise , first SetTimeOut and then second SetTimeOut :- 1,a,b



var a = 10; function abc(){ console.log(a);// var a = 20; console.log(a);// } console.log(a);// abc();//


10
10, error can not redeclare a as it is global scoped

10 undefined 20 


var a = {'key': 100}; var b = [] b[a] = 90; console.log(b);//

[object Object]: 90 var a = 50; var b = { name : 'abc' }; function abc(a,b){ console.log(a,b);// b.name = 'cde'; console.log(a,b);// } abc();// abc(a,b);// console.log(a,b);//

50, { name : 'abc' } -> 50, { name : ‘c’de }
50, { name : 'abc' } -> 50, { name : ‘c’de }
50, { name : 'abc' }


undefined undefined undefined undefined 50 { name: 'abc' } 50 { name: 'cde' } 50 { name: 'cde' } 

function foo() { let a = b = 0; a++; return a; } foo(); console.log(typeof a); // console.log(typeof b); //

1
undefined number 

 let a =10 { var a = 20 } console.log(a);//
SyntaxError: Identifier 'a' has already been declared

Sr React Native Developer

Interviewed at Zehn Solutions

2.1★
Mar 13, 2025

1. const shape = { radius: 10, diameter() { return this.radius * 2; }, perimeter: () => 2 * Math.PI * this.radius, }; console.log(shape.diameter());// console.log(shape.perimeter());//
20 NaN 
let obj = { x: 2, getX: function() { setTimeout(() => console.log('a'), 0);// new Promise( res => res(1)).then(v => console.log(v));// setTimeout(() => console.log('b'), 0);// } } obj.getX();

o/p :- promise , first SetTimeOut and then second SetTimeOut :- 1,a,b



var a = 10; function abc(){ console.log(a);// var a = 20; console.log(a);// } console.log(a);// abc();//


10
10, error can not redeclare a as it is global scoped

10 undefined 20 


var a = {'key': 100}; var b = [] b[a] = 90; console.log(b);//

[object Object]: 90 var a = 50; var b = { name : 'abc' }; function abc(a,b){ console.log(a,b);// b.name = 'cde'; console.log(a,b);// } abc();// abc(a,b);// console.log(a,b);//

50, { name : 'abc' } -> 50, { name : ‘c’de }
50, { name : 'abc' } -> 50, { name : ‘c’de }
50, { name : 'abc' }


undefined undefined undefined undefined 50 { name: 'abc' } 50 { name: 'cde' } 50 { name: 'cde' } 

function foo() { let a = b = 0; a++; return a; } foo(); console.log(typeof a); // console.log(typeof b); //

1
undefined number 

 let a =10 { var a = 20 } console.log(a);//
SyntaxError: Identifier 'a' has already been declared

As a lead, if you get a requirement to design a screen, what is your approach? How do you prevent a component from unnecessary loading? Have you heard of Hook? what are the testing framworks you use for unit testing? How do you copy a Javascript object? How do you test an end to end use case in React? What are the potential issues when you register for an even listeners?
avatar

React Native Developer

Interviewed at AXA

3.9★
Feb 26, 2021

As a lead, if you get a requirement to design a screen, what is your approach? How do you prevent a component from unnecessary loading? Have you heard of Hook? what are the testing framworks you use for unit testing? How do you copy a Javascript object? How do you test an end to end use case in React? What are the potential issues when you register for an even listeners?

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