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Increment a date using Ruby

This Ruby code converts a string into a date and increments the day, week, month, quarter or year.

def date_add(sdate='', unit='',i=0)

  sdate[/(\d+)\/(\d+)\/(\d+)\s(\d+):(\d+):(\d+)/]
  iyear = $3.to_i; imonth = $2.to_i; iday = $1.to_i; ihour = $4.to_i; imin = $5.to_i; isec = $6.to_i
  
  case  unit
    when 'days'
      t1 = Time.local(iyear,imonth,iday,ihour,imin,isec)
      t1 += (60 * 60 * 24 * i)
    when 'weeks'
      t1 = Time.local(iyear,imonth,iday,ihour,imin,isec)
      t1 += (60 * 60 * 24 * 7 * i) 
    when 'months'
      imonth += i
      if imonth < 12 then
        t1 = Time.local(iyear,imonth+i,iday,ihour,imin,isec)
      else
        t1 = Time.local(iyear+=1,imonth -12,iday,ihour,imin,isec)
      end
    when 'quarter'
      imonth += 3
      if imonth <= 12 then
        t1 = Time.local(iyear,imonth,iday,ihour,imin,isec)
      else
        t1 = Time.local(iyear+=1,imonth - 12,iday,ihour,imin,isec)
      end    
    when 'years'
      t1 = Time.local(iyear+i,imonth,iday,ihour,imin,isec)
    else
      raise 'not a valid date unit'
  end
  t1
end


date_add("17/03/2008 17:48:00",'months',2)

output: Sat May 17 17:48:00 +0100 2008

to ruby date regex string convert year month day add addition increment by jrobertson on Mar 05, 2008

svn-add-all-new-files

alias svn-add-all-new-files='svn st|grep ^?|sed s/?//|xargs svn add $1'
to bash svn add by sessy on Oct 31, 2007

HTML/JavaScript - Select list - Add/Remove Options (DOM)

from http://www.mredkj.com/tutorials/tutorial005.html


Overview

* Insert Before Selected - A new option is created and added above the selected option (as determined by selectedIndex). If none are selected, then no option is added.
* Remove Selected - Deletes the selected option (or options) from the list. If no options are selected, no options are deleted.
* Append Last - No matter what is selected, a new option is added at the end.
* Remove Last - No matter what is selected, the last option is deleted from the list.


Explanation

According to DOM Level 1, the following is the syntax for the add and remove methods in HTMLSelectElement:

void add(in HTMLElement element, in HTMLElement before) raises(DOMException);
void remove(in long index);

The add method takes two arguments: the element to add, and the element to insert before. The spec also says you can add to the end of the list by passing null as the second argument.

The remove method just takes a number: the index of the option to be removed.


The JavaScript
<script language="JavaScript" type="text/javascript">
<!--
var count1 = 0;
var count2 = 0;

function insertOptionBefore(num)
{
  var elSel = document.getElementById('selectX');
  if (elSel.selectedIndex >= 0) {
    var elOptNew = document.createElement('option');
    elOptNew.text = 'Insert' + num;
    elOptNew.value = 'insert' + num;
    var elOptOld = elSel.options[elSel.selectedIndex];  
    try {
      elSel.add(elOptNew, elOptOld); // standards compliant; doesn't work in IE
    }
    catch(ex) {
      elSel.add(elOptNew, elSel.selectedIndex); // IE only
    }
  }
}

function removeOptionSelected()
{
  var elSel = document.getElementById('selectX');
  var i;
  for (i = elSel.length - 1; i>=0; i--) {
    if (elSel.options[i].selected) {
      elSel.remove(i);
    }
  }
}

function appendOptionLast(num)
{
  var elOptNew = document.createElement('option');
  elOptNew.text = 'Append' + num;
  elOptNew.value = 'append' + num;
  var elSel = document.getElementById('selectX');

  try {
    elSel.add(elOptNew, null); // standards compliant; doesn't work in IE
  }
  catch(ex) {
    elSel.add(elOptNew); // IE only
  }
}

function removeOptionLast()
{
  var elSel = document.getElementById('selectX');
  if (elSel.length > 0)
  {
    elSel.remove(elSel.length - 1);
  }
}
//-->
</script>



The HTML
<form>
<input type="button" value="o" onclick="insertOptionBefore(count1++);" />
Insert Before Selected<br />
<input type="button" value="o" onclick="removeOptionSelected();" />
Remove Selected<br />
<select id="selectX" size="10" multiple="multiple">
<option value="original1" selected="selected">Orig1</option>
<option value="original2">Orig2</option>
</select>
<br />
<input type="button" value="o" onclick="appendOptionLast(count2++);" />
Append Last<br />
<input type="button" value="o" onclick="removeOptionLast();" />
Remove Last
</form>

to javascript dom select remove add options by bradalyst on Aug 22, 2007

Javascript Manipulate Class Names

I often have to manipulate class names of objects in javascript.
But className can have multiple classes in it.
These functions deal with that.

// ----------------------------------------------------------------------------
// HasClassName
//
// Description : returns boolean indicating whether the object has the class name
//    built with the understanding that there may be multiple classes
//
// Arguments:
//    objElement              - element to manipulate
//    strClass                - class name to add
//
function HasClassName(objElement, strClass)
   {

   // if there is a class
   if ( objElement.className )
      {

      // the classes are just a space separated list, so first get the list
      var arrList = objElement.className.split(' ');

      // get uppercase class for comparison purposes
      var strClassUpper = strClass.toUpperCase();

      // find all instances and remove them
      for ( var i = 0; i < arrList.length; i++ )
         {

         // if class found
         if ( arrList[i].toUpperCase() == strClassUpper )
            {

            // we found it
            return true;

            }

         }

      }

   // if we got here then the class name is not there
   return false;

   }
// 
// HasClassName
// ----------------------------------------------------------------------------


// ----------------------------------------------------------------------------
// AddClassName
//
// Description : adds a class to the class attribute of a DOM element
//    built with the understanding that there may be multiple classes
//
// Arguments:
//    objElement              - element to manipulate
//    strClass                - class name to add
//
function AddClassName(objElement, strClass, blnMayAlreadyExist)
   {

   // if there is a class
   if ( objElement.className )
      {

      // the classes are just a space separated list, so first get the list
      var arrList = objElement.className.split(' ');

      // if the new class name may already exist in list
      if ( blnMayAlreadyExist )
         {

         // get uppercase class for comparison purposes
         var strClassUpper = strClass.toUpperCase();

         // find all instances and remove them
         for ( var i = 0; i < arrList.length; i++ )
            {

            // if class found
            if ( arrList[i].toUpperCase() == strClassUpper )
               {

               // remove array item
               arrList.splice(i, 1);

               // decrement loop counter as we have adjusted the array's contents
               i--;

               }

            }

         }

      // add the new class to end of list
      arrList[arrList.length] = strClass;

      // add the new class to beginning of list
      //arrList.splice(0, 0, strClass);
      
      // assign modified class name attribute
      objElement.className = arrList.join(' ');

      }
   // if there was no class
   else
      {

      // assign modified class name attribute      
      objElement.className = strClass;
   
      }

   }
// 
// AddClassName
// ----------------------------------------------------------------------------


// ----------------------------------------------------------------------------
// RemoveClassName
//
// Description : removes a class from the class attribute of a DOM element
//    built with the understanding that there may be multiple classes
//
// Arguments:
//    objElement              - element to manipulate
//    strClass                - class name to remove
//
function RemoveClassName(objElement, strClass)
   {

   // if there is a class
   if ( objElement.className )
      {

      // the classes are just a space separated list, so first get the list
      var arrList = objElement.className.split(' ');

      // get uppercase class for comparison purposes
      var strClassUpper = strClass.toUpperCase();

      // find all instances and remove them
      for ( var i = 0; i < arrList.length; i++ )
         {

         // if class found
         if ( arrList[i].toUpperCase() == strClassUpper )
            {

            // remove array item
            arrList.splice(i, 1);

            // decrement loop counter as we have adjusted the array's contents
            i--;

            }

         }

      // assign modified class name attribute
      objElement.className = arrList.join(' ');

      }
   // if there was no class
   // there is nothing to remove

   }
// 
// RemoveClassName
// ----------------------------------------------------------------------------
to javascript class remove add className by Will_Rickards on Sep 20, 2006

Addition for hashes in Ruby

Why, oh, why is there no addition for hashes in Ruby? 'update' can do the trick, but only returns what was updated, rather than the whole updated hash. It also forces an update rather than being passive.

Sometimes you only want to temporarily do an add, and this is how I pulled it off:

class Hash
  def +(add)
    temp = {}
    add.each{|k,v| temp[k] = v}
    self.each{|k,v| temp[k] = v}
    temp
  end
end


Now you can do stuff like:

x = { :a => 1 }
y = { :b => 2 }

# x + y => { :a => 1, :b => 2 }, but x and y are untouched
# x + { :c => 3 } => { :a => 1, :c => 3 }


If you want to force an add, it's easy:

x += y => { :a => 1, :b => 2 } (this is now what x contains)
to ruby hash add hashes overriding addition by peter on Feb 20, 2006 5 Comments

add face to pane snippet

add-button: does [
    append lay/pane layout/offset [
        button [alert "I'm new!"]
    ] 100x100
    show lay
]
view lay: layout [size 400x300 button [add-button]]
to REBOL face pane add by gregg.irwin on Jan 18, 2006

add face to pane snippet

add-button: does [
    append lay/pane layout/offset [
        button [alert "I'm new!"]
    ] 100x100
    show lay
]
view lay: layout [size 400x300 button [add-button]]
to REBOL face pane add by gregg.irwin on Jan 18, 2006
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