Total 20 question (100 marks)
- 1. What is the mean of += operator in the below code? var fullname = "Jonh"; fullname += " Hug"; alert(fullname);
- 2. What function help convert a string to a number?
- 3. What loop bellow is the correct syntax?
- 4. What is the result of "variable"? var variable; if (""){ variable = true; } else { variable = 55; }
- 5. How to declare a variable in javascript?
- 6. What is the correct syntax to comments one line code in JavaScript?
- 7. What is the return value of bellow code? var num = 23; function evil () { num += 5; } evil(); console.log(num);
- 8. What is the result of the below code? while (i < 5) { i++; if (i == 3) {
- 9. Where does the HTML page allow you to write javascript?
- 10. What is different between let and var in Javascript?
- 11. How to insert a multi-line comment in JavaScript?
- 12. What is the output of this program? var a23 = 1; function b24(){ a23 = 10; return; function a23() {
- 13. What is the output of this program? function main() { try { f77(); } catch(e) { console.log(e); }; try
- 14. Which company has developed Javascript?
- 15. What is the difference between == and === compare operators in Javascript?
- 16. What is the output of the IF/ELSE command bellow? if (5 > 10) { console.log("Not so sure about this"); } else
- 17. How to assign value to the myName variable but still keep old value? Select the right answer.
- 18. Select the right options about function in Javascript
- 19. Select the correct IF condition below of Javascript.
- 20. How to check the age variable is a number or not? var age ="12abc";