JavaScript code quiz questions and answers

JavaScript code quiz questions and answers

What will happen when the following code is executed?

var x = 5;
console.log(x);
if (true) {
    var x = 6;
    console.log(x);
}
console.log(x);
//The Output will be -
5
6
6

What will happen when the following code is executed?
var x = 5;
console.log(x);
if (false) {
    var x = 6;
    console.log(x);
}
console.log(x);
//The Output will be -
5
5

What will happen when the following code is executed?
var x = 5;
function a() {
    var x = 6;
    return x;
}
console.log(x);
console.log(a());
//The Output will be -
5
6

What will happen when the following code is executed?
var x = 5;
function a() {
    x = 6;
    return x;
}
console.log(x);
console.log(a());
//The Output will be -
5
6

What will happen when the following code is executed?
var x = 5;
function a() {
    let x = 6;
    return x;
}
console.log(x);
console.log(a());
//The Output will be -
5
6

What will happen when the following code is executed?
let x = 5;
function a() {
    let x = 6;
    return x;
}
console.log(x);
console.log(a());
//The Output will be -
5
6

What will happen when the following code is executed?
const x = 5;
function a() {
    let x = 6;
    return x;
}
console.log(x);
console.log(a());
//The Output will be -
Uncaught SyntaxError: Identifier 'x' has already been declared
at<anonymous>: 1: 1

What will happen when the following code is executed?
const x = 5;
function a() {
    x = 6;
    return x;
}
console.log(x);
console.log(a());
//The Output will be -
Uncaught SyntaxError: Identifier 'x' has already been declared
at<anonymous>: 1: 1

What will happen when the following code is executed?
const x = 5;
function a() {
    const x = 6;
    return x;
}
console.log(x);
console.log(a());
//The Output will be -
Uncaught SyntaxError: Identifier 'x' has already been declared
at<anonymous>: 1: 1

What will happen when the following code is executed?
const x = 5;
function a() {
    var x = 6;
    return x;
}
console.log(x);
console.log(a());
//The Output will be -
Uncaught SyntaxError: Identifier 'x' has already been declared
at<anonymous>: 1: 1

What will happen when the following code is executed?
var x = 5;
function a() {
    const x = 6;
    return x;
}
console.log(x);
console.log(a());
//The Output will be -
5
6

What will happen when the following code is executed?
let x = 5;
function a() {
    var x = 6;
    return x;
}
console.log(x);
console.log(a());
//The Output will be -
Uncaught SyntaxError: Identifier 'x' has already been declared
at<anonymous>: 1: 1

What will happen when the following code is executed?
var x = 5;
function a() {
    var x = 6;
    return x;
}
x;
a();
//The Output will be -
6

What will happen when the following code is executed?
var x = 5;
function a() {
    var x = 6;
    return x;
}
x = a();
//The Output will be -
6

What will happen when the following code is executed?
var x = 5;
function a() {s
    var x = 6;
    return x;
}
x
//The Output will be -
5

What will happen when the following code is executed?
var x = 5;
function a() {
    var x = 6;
    return x;
}
console.log(x);
console.log(a());
//The Output will be -
5
6

What will happen when the following code is executed?
var x = 5;
function a() {
    var x = 6;
}
console.log(x);
console.log(a());
//The Output will be -
5

What will happen when the following code is executed?
var x = 5;
function a() {
    let x = 6; return x;
}
console.log(x);
console.log(a());
//The Output will be -
5
6

ANIL SINGH

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