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Thread: [RESOLVED] Converting 2-d array into array of objects.

  1. #1
    Join Date
    Sep 2008
    Location
    Jackson MS
    Posts
    585

    resolved [RESOLVED] Converting 2-d array into array of objects.

    I have the following in a withholding tax calculation page:
    Code:
    var EXEMPT = 3800;        // May change in later years, see Publication 15, Circular E, Employer's Tax Guide from the IRS
    var STable = [ // Define Single Table
    	[     0,        0,   0],  // Range, base, percentage
    	[  2150,        0, .10],
    	[ 10850,   870.00, .15],  // With >= 10850 & < 37500, tax is $870.00 + 15% of the amount over $10850
    	[ 37500,  4867.50, .25],
    	[ 87800, 17442.50, .28],
    	[180800, 43482.50, .33],
    	[390500, 112683.50, .35]	// Note: no comma at end
    ];
    ......................................
      for (var exmp=0; exmp < 8; exmp++) {
        var WkAmt = AnnAmt - EXEMPT * exmp;
        for (i=0; (i < (STable.length - 1)) && (WkAmt > STable[i+1][0]) ; i++) ;  //Search Singles table for proper bracket.
        var AnnTax = STable[i][1] + (WkAmt - STable[i][0]) * STable[i][2];
    	document.tax2012.elements[TableSub++].value = Nformat(AnnTax / NoPeriods);
      }
    The 2nd subscript indicates what field is used and is always constant. How can I change this into a one dimension table of objects with three fields/properties? TIA

    BTW, this is the website: tax12.html.

  2. #2
    Join Date
    Oct 2010
    Location
    Versailles, France
    Posts
    1,290
    This could be respond to your question
    Code:
    <script type="text/javascript">
    var STable = [ // Define Single Table
    	[     0,        0,   0],  // Range, base, rate
    	[  2150,        0, .10],
    	[ 10850,   870.00, .15],  // With >= 10850 & < 37500, tax is $870.00 + 15&#37; of the amount over $10850
    	[ 37500,  4867.50, .25],
    	[ 87800, 17442.50, .28],
    	[180800, 43482.50, .33],
    	[390500, 112683.50, .35]	// Note: no comma at end
    ];
    // To allows alert (which call a toString() function) with object like with tables
    Object.prototype.toString=function(){var i,c='\n';for (i in this) c+='\nkey '+i+' => value '+this[i];return c}
    
    // A constructor
    function Obj(range,base,rate){this.range=range;this.base=base;this.rate=rate;}
    
    // A loop to build an unidimensional Array of objects
    var STableObj=[];
    for (var i=0;i<STable.length;i++) STableObj[STableObj.length]=new Obj(STable[i][0],STable[i][1],STable[i][2]);
    
    // The result
    alert(STableObj)
    
    // this table seems to use like this
    var amount=40000,availableBracket=STableObj.length-1;
    while (availableBracket && amount<STableObj[availableBracket].range) availableBracket--;
    alert(availableBracket)
    tax = STableObj[availableBracket].base+(amount-STableObj[availableBracket].range)*STableObj[availableBracket].rate 
    alert(tax)
    
    </script>
    Last edited by 007Julien; 02-17-2012 at 11:46 AM.

  3. #3
    Join Date
    Nov 2007
    Posts
    511
    For creating a custom object with that data, this works.
    Or are you looking for code that does the conversion? (e.g., you are forced to receive the information as a 2D array but prefer to work with an single array of objects instead?

    Code:
    <script>
    function taxTable(range,base,percentage){
    	this.range = range;
    	this.base = base;
    	this.percentage = percentage;
    }
    
    arrSTable = new Array();
    arrSTable[0] = new taxTable("0","0","0");
    arrSTable[1] = new taxTable("2150","0",".10");
    arrSTable[2] = new taxTable("10850","870.00",".15");
    arrSTable[3] = new taxTable("37500","4867.50",".25");
    arrSTable[4] = new taxTable("87800","17442.50",".28");
    arrSTable[5] = new taxTable("180800","43482.50",".33");
    arrSTable[6] = new taxTable("390500","112683.50",".35");
    
    for (i=0; i<arrSTable.length;i++){
    	document.write ("<p>Range: " + arrSTable[i].range + ", Base: " + arrSTable[i].base + ", Percentage: " + arrSTable[i].percentage + "</p>");
    }
    </script>
    Last edited by nap0leon; 02-17-2012 at 11:54 AM.

  4. #4
    Join Date
    Sep 2008
    Location
    Jackson MS
    Posts
    585
    I've never worked with objects except in a "class" and this is a first chance to plunge in. The tables don't change for a year so I can use any method that works to load them. A 2-d table makes sense when each element contains the same type of data.

    Plenty of food for thought--thanks people for looking into it.

  5. #5
    Join Date
    Sep 2008
    Location
    Jackson MS
    Posts
    585

    resolved

    Done. Link is on the first message.

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