Page Comparison

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function TEMconvertString(V){
   if (!V) { return ''} else { return V.toString(); }
}

function TEMexpandLine(Tokens, Row, Array){
   for (var i =0; i < Tokens.length-1; i+=2){
      Array.push(Tokens[i]);
      Array.push(TEMconvertString(Row[Tokens[i+1]])
         .replaceAll("&", "&amp;")
         .replaceAll("<", "&lt;")
         .replaceAll(">", "&gt;"))
   }
   Array.push(Tokens[Tokens.length-1]);
}

function TEMexpand(Data, Template){
   var Array = [];
   var Tokens = Template.replaceAll("$$", "_FuNkYDolARAM").split('$');
   for (var i =0; i < Data.length; i++){
      TEMexpandLine(Tokens, Data[i], Array);
   }
   return Array.join('').replaceAll("_FuNkYDolARAM", "$");
}

What are the advantages compared to using a more fully featured templating system like Mustache?

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The

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code

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does

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Zero fancy features - nothing whatsoever resembling a language with if conditionals and so on. Therefore zero danger of the templating library becoming a crappy language.

• There are no fancy callback features to tempt developers to write complicated code. It’s only going to work with an array of data.

• No caching or other unnecessary pre-mature optimizations - simple code will be faster anyway.

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Putting the responsibility elsewhere for handling logic in absence of data etc. Encouraging separation of concerns.

The code does use some techniques which are worth understanding:

• We use an array of string strings and concatenate them at the end for performance.

• We escape characters like & < and > to translate into HTML entities so that data can be not mis-interpreted and HTML markup.

• We use a magic token '_FuNkYDolARAM' to handle the convention of allows a double $$ escape sequence to represent a $ character.

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