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From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Newsgroups: comp.lang.javascript
Subject: Re: Bignumb addition function, suggestion improvements.
Date: Sat, 14 Mar 2015 20:56:08 +0100
Organization: PointedEars Software (PES)
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Ben Bacarisse wrote:

> jonas.thornvall@gmail.com writes:
>> Den lördag 14 mars 2015 kl. 14:41:35 UTC+1 skrev Ben Bacarisse:
>>> String.prototype.digitValueAt = function (pos) {
>>>     var d = this.charCodeAt(pos);
>>>     return isNaN(d) ? 0 : d - 48;
>>> }
>>
>> I do not get ? 0 : d - 48;
> 
> https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Conditional_Operator
> 
> The 48 is "0".charCodeAt(0) which would be have been more
> self-documenting.

Apropos:

  s.digitValueAt(pos)

where s is a String, would be equivalent to

  +s.charAt(pos) || 0

or even

  +s[pos] || 0

in JavaScript 1.5+ and more recent implementations of ECMAScript.  (“…[…]” 
is _not_ an operation.)

<http://PointedEars.de/es-matrix/?filter=%5E%5C%2B%7C%5Estring%5C%5B%7CcharAt>

-- 
PointedEars
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