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Message-ID: <1744237.gKV8rdnPMv@PointedEars.de>
From: Thomas 'PointedEars' Lahn <PointedEars@web.de>
Reply-To: Thomas 'PointedEars' Lahn <cljs@PointedEars.de>
Organization: PointedEars Software (PES)
Date: Tue, 17 Dec 2013 15:12:55 +0100
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Subject: Re: Date Conversion ?
Newsgroups: comp.lang.javascript
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Denis McMahon wrote:

> On Tue, 17 Dec 2013 07:06:55 +0700, JJ wrote:
>>> Suggestion or Code very welcome.
>>> 
>>> btw, I can supply *my* code down to producing a correect date value,
>>> but it is clumsy and embarassing. But I will if you insist.
>> 
>> Fix the date string then make them to a Date object so that you can get
>> the timestamp integer value.
>> 
>> function parseDate(dateStr) {
>>   //for "Mmm dd/yy" format, year 20nn only.
>>   //converts to "Mmm dd yyyy" (good for FF, IE8, Chrome, Opera).
>>   //returns NaN if dateStr is in invalid format.
>>   var date=dateStr.replace(/([a-z]+ \d+)\/(\d+)/,"$1 20$2"); return (new
>>   Date(date)).valueOf();
>> }
> 
> To walk an array of numbers once to find the min and max values:
> 
> var low, high, i;
> low = high = arr[0];
> for( i = 1; i < arr.length; i++ ) {
> if ( arr[i] < low ) low = arr[i];
> if ( arr[i] > high ) high = arr[i];
> }
> 
> // low and high are now the minimum and maximum values from the array

In implementations of ECMAScript Ed. 3, it is easier and probably more 
efficient to use the built-in Math.min() and Math.max() methods:

  var low = Math.min.apply(Math, arr);
  var high = Math.max.apply(Math, arr);

They also work for Date instances as Array elements because they convert the 
arguments to Number before comparison.  In general, if these methods are 
implemented, it is easiest to overwrite the “valueOf” property of the 
prototype object of the objects for the call – or provide the objects 
themselves with one –, which is triggered first by the internal ToNumber 
algorithm when called with hint Number.

<http://ecma-international.org/ecma-262/5.1/#sec-15.8.2.11>
<http://ecma-international.org/ecma-262/5.1/#sec-9.3>
<http://ecma-international.org/ecma-262/5.1/#sec-9.1>
<http://ecma-international.org/ecma-262/5.1/#sec-8.12.8>
<http://ecma-international.org/ecma-262/5.1/#sec-15.9.5.8>

One can also access the first and last element of a sorted array:

  var sortedCopy = arr.slice().sort(function (a, b) { return a - b; });
  var low = sortedCopy[0];
  var high = sortedCopy[sortedCopy.length - 1];

<http://ecma-international.org/ecma-262/5.1/#sec-15.4.4.11>

Finally, all implementations of ECMAScript Ed. 5 – not just JavaScript 
anymore – provide Array.prototype.reduce(), as mentioned by Björn:

  var low = arr.reduce(
    function (accumulator, e, i, a) {
      if (е < accumulator)
      {
        return e;
      }

      return accumulator;
    },
    arr[0]);

<http://ecma-international.org/ecma-262/5.1/#sec-15.4.4.21>

There appears to be no point to use .map() here because if you have .map() 
you have .reduce() and can thereby shorten the scope chain.
  
-- 
PointedEars

Twitter: @PointedEars2
Please do not Cc: me. / Bitte keine Kopien per E-Mail.