Well, I'm having some problems with the following code snippet:
alert(lineOut[i].trim() + " - - " + lineOut[i + 1].trim());
Uncaught TypeError: Can not read property 'trim' of undefined (...)
The array lineOut is a dynamically populated array, which at the time of execution of the above excerpt has the following values:
lineOut = ["6", "Comentario"];
Can anyone give me a glimpse of why this problem is happening?
Your code should look like this:
var total = lineOut.length;
for (var i = 0; i < total; i++) {
alert(lineOut[i].trim() + " - - " + lineOut[i + 1].trim());
}
The problem is that in the last iteration, i is (total - 1) and the lineOut array goes from lineOut[0], lineOut[1], ..., lineOut[total - 1] . You are trying to get lineOut[i + 1] , which is equal to lineOut[(total - 1) + 1] , that is, lineOut[total] , which is out of bounds (only goes to lineOut[total - 1] ).
When you try to access something outside the bounds of an array, JS returns undefined .