Answer following Interesting Interview Questions

Question

What is the Output of the following lines:

Kindly post your respective answers so that we all can get some clarity in depth.

console.log(1 +- "2" + "2");
console.log(1 +- "1" + "2");
console.log(+"1" + "1" + "2");
console.log("A"-"B"+"2");
console.log("A"-"B"+2);

Note:

The main purpose of asking this question here is:
Why 2 values (Undefined & some value) are printing when checking in console?

Can any one please solve my doubt?
Thanks inadvance.

Thanks for your interest. kindly Provide your answers for those above lines. — Raghu Kiran K S, May 08 '19 at 10:52
@JonasWilms For a true knowledge seeker, that comment would have triggered the inquisitiveness to ask why — Krishna Prashatt, May 08 '19 at 10:58
Possible duplicate of [Chrome/Firefox console.log always appends a line saying undefined](https://stackoverflow.com/questions/14633968/chrome-firefox-console-log-always-appends-a-line-saying-undefined) — Amir Shabani, May 08 '19 at 11:15

Lucas_Bo · Answer 1 · 2019-05-08T11:20:47.070

-1

Every Statement returns undefined.

console.log(1 + "-2" + "2");  // undefined
console.log(1 +- "1" + "2"); // undefined 
console.log(+"1" + "1" + "2"); // undefined 
console.log("A"-"B"+"2"); // undefined 
console.log("A"-"B"+2); // undefined

edited May 08 '19 at 11:20

answered May 08 '19 at 10:59

Lucas_Bo

142
1
9

They **do** return `undefined`, but they also print something to the console. I believe the OP wanted to find out why those outputs were the way they were. – Amir Shabani May 08 '19 at 11:03

Answer following Interesting Interview Questions

What is the Output of the following lines:

Note:

1 Answers1