Do You Know Your JavaScript?

[SlightlyLoony]

What value will the following script print in the log?

var a = 'snake 31';
var b = /[0-9]+/.exec(a);
b += 2;
gs.log(b);

Open this post to get the answer...

The answer is: 312.

The first tricky bit is the regular expression in the second line. This simply extracts the number from from the variable "a", and returns a 31. But...the value stored in "b" is a string, not a number.

The second part that might trip you up is the addition in the third line. This simply concatenates the string "31" (in variable "b") with a 2. JavaScript converts the number 2 into the string "2" to do this, but only because the value in "b" is a string. If what you really wanted was to add the number 31 to the number 2 (to get 33), this script would accomplish that:

var a = 'snake 31';
var b = parseInt(/[0-9]+/.exec(a));
b += 2;
gs.log(b);