Question

I have string looking like this:

01
02
03
99

I’d like to parse these to make them into strings like:

 1. 2. 3. 99. etc. 

The numbers are a maximum of 2 characters. Also I have to parse some more numbers later in the source string so I would like to learn the substring equivalent in javascript. Can someone give me advice on how I can do. Previously I had been doing it in C# with the following:

int.Parse(RowKey.Substring(0, 2)).ToString() + "."

Thanks

Answer 1

Why, parseInt of course.

// Add 2 until end of string
var originalA = "01020399";
for (var i = 0; i < originalA.length; i += 2)
{
  document.write(parseInt(originalA.substr(i, 2), 10) + ". ");
}

// Split on carriage returns
var originalB = "01\n02\n03\n99";
var strArrayB = originalB.split("\n");
for (var i = 0; i < strArrayB.length; i++)
{
  document.write(parseInt(strArrayB[i], 10) + ". ");
}

// Replace the leading zero with regular expressions
var originalC = "01\n02\n03\n99";
var strArrayC = originalC.split("\n");
var regExpC = /^0/;
for (var i = 0; i < strArrayC.length; i++)
{
  document.write(strArrayC[i].replace(regExpC, "") + ". ");
}

The other notes are that JavaScript is weakly typed, so "a" + 1 returns "a1". Additionally, for substrings you can choose between substring(start, end) and substr(start, length). If you’re just trying to pull a single character, "abcdefg"[2] will return "c" (zero-based index, so 2 means the third character). You usually won’t have to worry about type-casting when it comes to simple numbers or letters.

http://jsfiddle.net/mbwt4/3/