JavaScript log10

Returns the base-10 logarithm of the number

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1011
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function log10 (arg) {
    // Returns the base-10 logarithm of the number  
    // 
    // version: 1109.2015
    // discuss at: http://phpjs.org/functions/log10    // +   original by: Philip Peterson
    // +   improved by: Onno Marsman
    // +   improved by: Tod Gentille
    // +   improved by: Brett Zamir (http://brett-zamir.me)
    // *     example 1: log10(10);    // *     returns 1: 1
    // *     example 2: log10(1);
    // *     returns 2: 0
    return Math.log(arg) / 2.302585092994046; // Math.LN10
}

Examples

» Example 1

Running

1

log10(10);

Should return

1

1

» Example 2

Running

1

log10(1);

Should return

1

Dependencies

No dependencies, you can use this function standalone.

Open syntax issues

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Eventually we want all code to pass or at least take into consideration most fixes suggested by JsLint, following this JsLint configuration we’ve decided on.

Authors

Thanks to the following developers, you get to have log10 goodness in JavaScript.

• Philip Peterson ( original )
• Onno Marsman ( improved )
• Tod Gentille ( improved )
• Brett Zamir ( improved )

Comments

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Use:

[CODE]
your_stuff('here');
[/CODE]

for proper code formatting
By submitting code here you are allowing us to use it in php.js hence dual licensing it under the MIT and GPL licenses

Kevin van Zonneveld
13 Nov '08

  @ Tod Gentille: I think so too. Thank you very much for pointing that out!

Tod Gentille
13 Nov '08

  I would suspect it would be more efficient to use the Javascript constant Math.LN10, the body of the function is then
[CODE="Javascript"]
return Math.log(arg)/Math.LN10;
[/CODE]

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