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Determine if value/index exists in an array?

Posted on 2014-04-10
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Last Modified: 2014-04-10
What is the best way to detect if I'm getting the values I expect in an array or if it is missing? for example;
var myArr = ['value0-0'];
var newValues = ['value1-0',1];
myArr.push(newValues);
newValues = ['value2-0',1];
myArr.push(newValues);
var newValues = ['value3-0',0];
myArr.push(newValues);
var newValues = ['value4-0'];
myArr.push(newValues);

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This could go on in any order etc. But I want to check to ensure that there is a second value? Can I do something like:
for (var i = 0; i < myArr.length; i++) {
    if((typeof (myArr[i][1])) !== 'undefined'){
        ... then do something
    }
}

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Question by:894359
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3 Comments
 
LVL 52

Accepted Solution

by:
Scott Fell,  EE MVE earned 500 total points
ID: 39993370
That looks fine but why not just create a function that checks for valid data

function addArr(newValues){
  if (newValues[0][1]!== 'undefined'){
      myArr.push(newValues);
  } 
}

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Author Comment

by:894359
ID: 39993374
I'm doing it as a safety measure as I might be reading other sources for data.
0
 
LVL 52

Expert Comment

by:Scott Fell, EE MVE
ID: 39993383
Then I would go with the function.  And if you are doing anything with the input server side with your database, make sure you double check it there as the js function can easily be worked around.
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