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# Add Thousands Separators To Numbers

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```I've finally figured out how to add thousands separators.

If there's a built in for this (like a `sprintf` parameters) I don't want to hear it.  I just don't, ok?

```
def ts( st )
st = st.reverse
r = ""
max = if st[-1].chr == '-'
st.size - 1
else
st.size
end
if st.to_i == st.to_f
1.upto(st.size) {|i| r << st[i-1].chr ; r << ',' if i%3 == 0 and i < max}
else
start = nil
1.upto(st.size) {|i|
r << st[i-1].chr
start = 0 if r[-1].chr == '.' and not start
if start
r << ',' if start % 3 == 0 and start != 0  and i < max
start += 1
end
}
end
r.reverse
end
```

That's it.

```
puts ts('100')
puts ts('1')
puts ts('1000')
puts ts('1000000.01')
puts ts('100046546510000.022435451')
puts ts('-100')
puts ts('-1')
puts ts('-1000')
puts ts('-1000000.01')
puts ts('-100046546510000.022435451')
```

outputs:

```
100
1
1,000
1,000,000.01
100,046,546,510,000.022435451
-100
-1
-1,000
-1,000,000.01
-100,046,546,510,000.022435451
```

It's ugly, yeah, but it works.```
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