I have problem with a plus in JS, I'm using node.js and fs

Question

I need that my code pluses 1 to some numbers, but if, for example, it receives 1, I get 11, not 2.

          fs.readFile(`${dir}/warns/${mentioned.id}.txt`, 'utf8', function(err, data) {
              var x = data;
              var y = 1;
              var z = x + y;
              fs.writeFile(`${dir}/warns/${mentioned.id}.txt`, `${z}`, 'utf8', function(err, result) {
                 if(err) console.log('error', err);
          });
          });
      };

`data` is a **string** so you have to explicitly force it to be a number. — Pointy, Mar 16 '20 at 13:48
You are receiving your value as a string. You must convert it to a number. For example, `var x = +data` — Weedoze, Mar 16 '20 at 13:48

score 0 · Accepted Answer · answered Mar 16 '20 at 13:48

0

You need to parse the text before doing the operation. Like this

var x = parseInt(data, 10);

in javascript string 1 with numeric 1 will concatenate.

answered Mar 16 '20 at 13:48

Ashish Modi

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This *might* be appropriate, but we don't know if `data` might have a fractional part. – Pointy Mar 16 '20 at 13:49

I have problem with a plus in JS, I'm using node.js and fs

1 Answers1