Online Access Free JavaScript-Developer-I Exam Questions

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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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No.# The three options that can be invoked to get a return value of 10 are:

B. sum(10)()
This will set num to 10 and return the inner function that expects two arguments. When called without arguments, it will return 10.

C. sum(5, 5)()
This will set num to 5 and return the inner function that expects two arguments. When called with arguments num2 and num3 set to 5, it will return 10.

E. sum(5)(5)
This will set num to 5 and return the inner function that expects one argument. When called with an argument of 5, it will return 10.