Javascript basics 6
Authored by Inna .
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29 questions
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1.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What will be the result of the following code? console.log(3 + '5');
8
35
53
15
2.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
How can you check if a variable x is of type "string"?
typeof(x) === 'string'
x.type === 'string'
x instanceof String
x.typeOf(String)
3.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is the purpose of the === operator in JS?
It performs type coercion.
It assigns a value to a variable.
It checks for equality without type conversion.
It concatenates two strings.
4.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
Which of the following is not a valid way to declare a variable in JS?
let x = 5;
const y = 10;
var z = 15;
variable w = 20;
5.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What will the following code snippet print to the console?const numbers = [1, 2, 3, 4, 5]; numbers.forEach(function(num) { console.log(num * 2); });
1 2 3 4 5
2 4 6 8 10
1 4 9 16 25
2 3 4 5 6
6.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
What is the output of the following code snippet? let a = 10; if (a > 5) { console.log('Hello'); } else { console.log('World'); }
Hello
World
Hello World
No output
7.
MULTIPLE CHOICE QUESTION
2 mins • 1 pt
How do you write an if statement that checks if a number x is positive?
if (x >= 0) { }
if (x > 0) { }
if (x < 0) { }
if (x == 0) { }
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