1
Well, I’m having some problems with the following code snippet:
alert(lineOut[i].trim() + " - - " + lineOut[i + 1].trim());
Uncaught Typeerror: Cannot read Property 'Trim' of Undefined(...)
The array lineOut is a dynamically populated array, which at the time of execution of the above passage has the following values:
lineOut = ["6", "Comentario"];
Can someone give me a clue as to why this problem is happening?
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Your code must look something 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, the i vale (total - 1) and the array lineOut goes from lineOut[0], lineOut[1], ..., lineOut[total - 1]. You’re trying to catch lineOut[i + 1], which is equal to lineOut[(total - 1) + 1], that is to say, lineOut[total], that is out of bounds (only goes up lineOut[total - 1]).
When you try to access something outside the limits of an array, JS returns undefined.
@Michele Akemi really that’s right, I’ll add a condition pro undefined. Thank you.
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How much is it worth
iat the time of execution?– Emoon
That code is running within a cycle
for? I see a risk ofi + 1be greater than the index of the last element of the array and giveundefinedbecause of this. As @Emoon asked, what is the value ofiand what is the value oflineOut.lengthwhen this error occurs?– Sergio
@Emoon
for(var i = 0; i<lineOut.length; i++)this is the header of my loop.– user42676
@Sergio
i = 0andlineOut.length = 2. But I’m probably overflowing the array index. I’m going to develop another logic to solve this problem. Thank you very much for the comment.– user42676