Info

Check whether a single character is a decimal digit ("0" to "9").

Preparation code

 
<script>
  Benchmark.prototype.setup = function() {
    function test(callback)
    {
        var values = [4, 2, "x", " ", "."];
    
        var digits = 0;
    
        var i = null;
        var length = values.length;
        for (i = 0; i < length; i += 1)
        {
            var character = values[i];
            if (callback(character) === true)
            {
                digits += 1;
            }
        }
    
        return digits;
    }
    
    function isDigitRange(character)
    {
        return (character >= "0" && character <= "9");
    }
    
    function isDigitCodeRange(character)
    {
        var c = ("" + character).charCodeAt(0);
        return ((c >= 48) && (c <= 57));
    }
    
    function isDigitIndex(character)
    {
        return ("0123456789".indexOf(character) >= 0);
    }
    
    function isDigitSwitch(character)
    {
        switch (character)
        {
            case "0":
            case "1":
            case "2":
            case "3":
            case "4":
            case "5":
            case "6":
            case "7":
            case "8":
            case "9":
                return true;
            default:
                return false;
            }
    }
    
    function testIsNan(character)
    {
        return (!isNaN(character));
    }
    
    function testIsNanParse(character)
    {
        return (!isNaN(parseInt(character, 10)));
    }
    
    function testIsFinite(character)
    {
        return (isFinite(character));
    }
    
    function testIsFiniteParse(character)
    {
        return (isFinite(parseInt(character, 10)));
    }
  };
</script>

Test runner

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test(isDigitRange);

test(isDigitCodeRange);

test(isDigitIndex);

test(isDigitSwitch);

test(testIsNan);

test(testIsNanParse);

test(testIsFinite);

test(testIsFiniteParse);

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Revisions

You can edit these tests or add even more tests to this page by appending /edit to the URL. Here’s a list of current revisions for this page:

• Revision 1: published by Ariya on 18th November 2011
• Revision 2: published by XP1 on 2nd February 2012

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