Element Array + 1 value

Question

Having trouble adding a value to an element array. An example of what I currently have.

array[1] current example is value of 10
var total = array[1] + 1; // result is 101

I need total to be 11, I also tried the bellow example, same thing.

var total = array[1].toString() + 1; // result 101

Using `.toString()` is the opposite of what you need, because your array appears to contain strings already - is there a reason you didn't populate it with numbers rather than strings? — nnnnnn, Jul 14 '16 at 08:55

score 1 · Accepted Answer · edited May 23 '17 at 11:51

1

Convert the string to Number before the addition otherwise, string concatenation will happen.

var total = +array[1] + 1;

edited May 23 '17 at 11:51

Community

answered Jul 14 '16 at 08:55

Pranav C Balan

Thank you, it worked, I'll approve the message in 10min. – Alex _TNT Jul 14 '16 at 08:56
1

Can you explain how an `+` unary operator converts the `string` to `Number`? – haim770 Jul 14 '16 at 08:56
1

I did try to find an answer before posting. ^ the above question might be useful for me too. Thanks again. – Alex _TNT Jul 14 '16 at 08:58
1

@haim770 +a ===Number(a), so it creates a number (primitive type, not a Number – Pablo Lozano Jul 14 '16 at 08:58

score 1 · Answer 2 · answered Jul 14 '16 at 08:57

1

10 must be in string format, Use parseInt or Uniary_plus to convert it to number

var array = ['10'];
var total = parseInt(array[0],10) + 1;
alert(total)

answered Jul 14 '16 at 08:57

brk

2 Answers2