what it will print console.log(1+ + “2”)

Question

Why does this JavaScript statement:

console.log(1 +  + \"2\");

print

3

as the output? I am not sure why

Answer 1

+ or - operand in front of a string converts it to number. so here +"2" will become 2 hence the result will be 3.

=> 1 + + "2"    // +"2" = 2
=> 1 +    2
=> 3

If you use - in between like

=> 1 - - "2"   // -"2" = -2
=> 1 - - 2     // 1 - (-2)
=> 1 + 2
=> 3

So,

     -"2" ==> -2
     +"2" ==>  2
 +"Hello" ==> NaN
 -"Hello" ==> NaN