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# counting numbers with commas

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 counting numbers with commas on Jan 28, 2016 at 3:23:02 pm

I am using the following expression to create a number countdown but I need it to recognize or insert commas in eight digit numbers. Can anyone tell me how to alter it:

P.S. there are also times that I'd like to add dollar signs or percent signs.

```startT = 0; endT = .5; beginVal = 12400000; endVal = 10700000; t = linear(time,startT,endT,beginVal,endVal); Math.floor(t) + ''```

 Re: counting numbers with commason Jan 28, 2016 at 6:00:38 pm

This should do what you need:

``` numDecimals = 0; commas = true; dollarSign = true; percentSign = false; startT = 0; endT = .5; beginCount = 12400000; endCount = 10700000; dur = 4; t = time - inPoint; s = linear (time, startT, endT, beginCount, endCount).toFixed(numDecimals); suffix = percentSign ? "%" : ""; prefix = ""; if (s[0] == "-"){ prefix = "-"; s = s.substr(1); } if(dollarSign) prefix += "\$"; if (commas){ decimals = ""; if (numDecimals > 0){ decimals = s.substr(-(numDecimals + 1)); s = s.substr(0,s.length - (numDecimals + 1)); } outStr = s.substr(-s.length, (s.length-1)%3 +1); for (i = Math.floor((s.length-1)/3); i > 0; i--){ outStr += "," + s.substr(-i*3,3); } prefix + outStr + decimals + suffix; }else{ prefix + s + suffix; } ```

Dan

 Re: counting numbers with commason Jan 28, 2016 at 10:48:18 pm

Try adding this as your last line. The first part adds the "\$" and the rest sorts out the commas. If you want to change how many numbers are needed before a comma, change the the number "7" below to what you need, say 3, which is standard.

`"\$" + Math.round(t).toFixed(0).replace(/(\d)(?=(\d{7})+(?!\d))/g, "\$1,");`

Declan Smith