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split to array is sometimes dangerous  [ 702 views ]

Goal: to notice the split function special feature

just split a delimited string to an array:

  console.log('1,2,3'.split(',').length); // --> 3

but there is a strange behavior

  console.log(''.split(',').length); // --> 1

we have an empty element! We need to check the source string is valid or not.

  var src = '';
  var arr = src ? src.split(',') : [];
  console.log(arr.length); // --> 0

The result is correct now. Just be careful.

Thursday, June 5th, 2014 at 08:58.
Filed under javascript.

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