JavaScript - Dictionary

javascript_dictionary.md

#JavaScript - Dictionary

This allows you to store and lookup dictionary name value pairs

###Construction

var Dictionary = function Dictionary(startValues) {  
  this.data = startValues || {};
}

Dictionary.prototype.store = function(name, value) {  
  this.data[name] = value;
};

Dictionary.prototype.lookup = function(name) {  
  return this.data[name];
};

Dictionary.prototype.contains = function(name) {  
  return Object.prototype.propertyIsEnumerable.call(this.data, name);
};

Dictionary.prototype.each = function(action) {  
  forEachIn(this.data, action);
};

Dictionary.prototype.names = function() {  
  var names = [];
  this.each(function(name, value) {names.push(name);});
  return names;
};

Dictionary.prototype.values = function() {
    var values = [];
    this.each(function(name, value) {
        values.push(value);
    });
    return values;
};

Dictionary.prototype.uniqueNames = function() {
    var names = [];
    this.each(function(name, value) {
        if (!arrayContains(name,names))
        {
            names.push(name);
        }
    });
    return names;
};

Dictionary.prototype.uniqueValues = function() {
    var values = [];
    this.each(function(name, value) {
        if (!arrayContains(value,values))
        {
            values.push(value);
        }
    });
    return values;
};

//Private Methods
function forEachIn(object, action) {  
    for (var property in object) {
        if (object.hasOwnProperty(property))
            action(property, object[property]);
    }
}

function arrayContains(name, arrayData)
{
    return (arrayData.indexOf(name) > -1);
}

###Example:

var colors = new Dictionary({Grover: "blue", Elmo: "red", Bert: "yellow"});

//Contains
colors.contains("Grover");
//true

//Lookup
colors.lookup("Elmo");
//'red'

//Store
colors.store("Ernie", "orange");

//Show Names
colors.names()
//[ 'Grover', 'Elmo', 'Bert', 'Earnie' ]

//View all
colors.each(function(name, color) {
  console.log(name, " is ", color);
});
//Grover is blue
//Elmo is red
//Bert is yellow
//Ernie is orange

colors.values()
//['blue', 'red','yellow', 'orange']