Online Access Free JavaScript-Developer-I Exam Questions

No.# B and D are the correct answers.
I tested them in a JS compiler. Check the code below.

// Sample variables
var var1 = 10;
var var2 = 20;

// Option A
console.log(var1 + var2); // This adds numbers, not strings (result: 30)
console.log(String(var1 + var2)); // Converts to string after addition, result: "30"

// Option B
console.log(var1.toString() + var2.toString()); // Correct way, result: "1020"

// Option C
// Incorrect syntax — there is no 'string' object. It should be 'String'
try {
console.log(string.concat(var1 + var2)); // This will cause an error
} catch (e) {
console.log("Error: 'string' is not defined",e);
}

// Option D
console.log(String(var1).concat(var2)); // Correct way, result: "1020"

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No.# A,D tested

No.# Answer is A, because when we use the keyword "let" we need to initialize the variable and we will get Syntax Error

No.# Console test:

let sampleText = 'The quick brown fox jumps';
undefined
sampleText.includes(' quick ') !== -1;
true
sampleText.includes('fox');
true
sampleText.includes(' fox ');
true
sampleText.includes(' quick ', 4);
false
sampleText.includes(' Fox ', 3)
false

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No.# Coreect ans is B...value is defined and has value Null

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No.# A C are the correct anwser

No.# function sum(num) {
if (num == undefined) {
num = 0;
}
return function (num2, num3) {
if (num3 === undefined) {
num3 = 0;
}
return num + num2 + num3;
}
}

The anwsers are correct, tested in console (A = 20 __ B & C = NaN __ C & D = 10)

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No.# Answer is A

function changeValue(param) {
param = 5;
}
let a = 10;
let b = a;
changeValue(b);
const result = a + " - " + b;
console.log('result ==> ', result);

No.# The correct answer is B and D.

B. dan.firstName + dan.lastName
D. dan.name()

No.# The question should be:
function changeValue(param) {
param = 5;
}
let a = 10;
let b = 10;
changeValue(b);
const result = a + " - " + b;
console.log('result ==> ', result);

No.# correct answer is D only

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