Node.js - Module exports static variable

Question

I'm attempting to export a module that should store a hashtable of given information so that another call to access that information can be checked for existence in the hashtable, and if found, return the value in the hashtable.

I am having trouble getting the hashtable in the export to remain consistent throughout the app as a singleton/static/global variable.

Here's what I have:

var Randomize = {

  hashTable: [],
  randomize:  function(rows) {

    var randomized = [];
    for(var i in rows) {
      //check if exists in hashtable, use values accordingly
    }
    return randomized;
  }

};

module.exports = Randomize;

And when I try to access it with:

var randomize = require('randomize');
/* ... */
console.log(randomize.randomize(rows))

It creates a new hashtable for each instance. How can I make it so that it reuses the same instance of hashtable?

Just store it in a variable var result = randomize.randomize(rows); — adeneo
– adeneo, Commented Feb 27, 2015 at 19:57
all you show is an empty array named hashTable. what happens after that? — user2524973
– user2524973, Commented Feb 27, 2015 at 21:07

floatingLomas · Accepted Answer · 2015-02-27 20:15:44Z

4

Your hashtable might be in the wrong scope - it's possibly being clobbered with each require. Try this instead:

var hashTable = [];

var Randomize = {

  hashTable: hashTable,
  randomize:  function(rows) {

    var randomized = [];
    for(var i in rows) {
      //check if exists in hashtable, use values accordingly
    }
    return randomized;
  }
};

module.exports = Randomize;

answered Feb 27, 2015 at 20:15

floatingLomas

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