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I am trying to learn Javascript. Here I am confused with the following code.
http://rendera.heroku.com/usercode/eae2b0f40cf503b36ee346f5c511b0e29fc82f9e
When I put x+y in the function it is going wrong. For example 2+2=22, 5+7=57
But /, *, - are working. Why is + not working? Please help me. Thanks a lot in advance
578
1 Answer. This happens when one or both of the variables is String which results in string concatenation. The arithmetic operators like / * - performs a toNumber conversion on the string(s). In order to convert a string to a number : use the unary + operator.
Add numbers in JavaScript by placing a plus sign between them. You can also use the following syntax to perform addition: var x+=y; The "+=" operator tells JavaScript to add the variable on the right side of the operator to the variable on the left.
Difference between += and =+ in javascript the correct syntax is a+=b; a=+b; is not correct. it is simply assigning b value to a.
The addition assignment operator ( += ) adds the value of the right operand to a variable and assigns the result to the variable. The types of the two operands determine the behavior of the addition assignment operator.
One or both of the variables is a string instead of a number. This makes the + do string concatenation.
'2' + 2 === '22'; // true 2 + 2 === 4; // true The other arithmetic operators / * - will perform a toNumber conversion on the string(s).
'3' * '5' === 15; // true A quick way to convert a string to a number is to use the unary + operator.
+'2' + 2 === 4; // true ...or with your variables:
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