Explain pls the output of this code

Question

var x ="5", y=10
document.write(+x+y)
The output is 15.
Why? I thought it should be something like 510...

Answer 1

+ symbol before X converts X into number/interger type, therfore answer is 15.

Answer 2

Rhythm Khandelwal 「ＨＡＰＰＹ ＴＯ ＨＥＬＰ」 thankyou guys ☺ that makes sense