Test: Loops in JS - 2 - Software Development MCQ
15 Questions MCQ Test - Test: Loops in JS - 2
Which loop in JavaScript is suitable when the number of iterations is unknown?
Which loop in JavaScript is used to iterate over the properties of an object?
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What is the key difference between a for loop and a for...in loop?
Which loop in JavaScript is used to iterate over the elements of an array?
What will be the output of the following code?
let i = 1;
while (i <= 5) {
console.log(i);
i++;
}
What will be the output of the following code?
let obj = { a: 1, b: 2, c: 3 };
for (let key in obj) {
console.log(key);
}
What will be the output of the following code?
let arr = [1, 2, 3, 4, 5];
for (let element of arr) {
console.log(element);
}
What will be the output of the following code?
let i = 5;
do {
console.log(i);
i--;
} while (i >= 1);
What will be the output of the following code?
let obj = { a: 1, b: 2, c: 3 };
for (let value of obj) {
console.log(value);
}
Which loop is more suitable for iterating over the values of an iterable object like an array?
Which loop is used to iterate over the characters of a string?
What is the output of the following code?
let obj = { a: 1, b: 2, c: 3 };
for (let key in obj) {
console.log(obj[key]);
}
What will be the value of 'i' after the execution of the following code?
let i = 0;
for (; i < 5; i++) {}
What will be the output of the following code?
let arr = [1, 2, 3, 4, 5];
for (let element of arr) {
if (element === 3) {
break;
}
console.log(element);
}
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