How to create and add values to a JavaScript Dictionary

Question

I'm trying to create a Dictionary with a key and a value list pair. I'm able to create a dictionary for a key value pair but I need to insert a list of Items as value for a key value. Here is my approach:

keys = ['A', 'B', 'C'];
Elements Corresponding to 'A' : 'apple'
Elements Corresponding to 'B' : 'ball', 'balloon','bear'
Elements Corresponding to 'C' : 'cat','cow'

and my result should be like:

{ key:'A' value:['apple'], key:'B' value:['ball',balloon','bear'], Key:C' value:['cat','cow']}

Here is just a sample data, I will get data dynamically from a table.Please help me out.Thanks In advance.

I don't really understand, it seems that you already answered your question. Just use an array as value for each key and append the items to the array. — Hans
– Hans, Commented Jan 2, 2014 at 12:38
I explained my problem with an example data... All I would get is a dynamic data. I don't even know how many elements would fall under a particular key value. — BeingNerd
– BeingNerd, Commented Jan 2, 2014 at 12:46

Mykola Prymak · Accepted Answer · 2014-01-02 13:03:05Z

3

This code can add a new key-value pair into some dictonary like object.

var dictionary= {};
function insertIntoDic(key, value) {
 // If key is not initialized or some bad structure
 if (!dictionary[key] || !(dictionary[key] instanceof Array)) {
    dictionary[key] = [];
 }
 // All arguments, exept first push as valuses to the dictonary
 dictionary[key] = dictionary[key].concat(Array.prototype.slice.call(arguments, 1));
 return dictionary;
}

edited Jan 2, 2014 at 13:03

answered Jan 2, 2014 at 12:49

Mykola Prymak

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6 Comments

BeingNerd Over a year ago

I've tried the same way but i'm getting only keys not the list items.

Mykola Prymak Over a year ago

I make the error in code, so it not append the items, just create the keys. I update the code - current version work as expect. Sorry.

BeingNerd Over a year ago

I tried out your solution but Didn't work for me. I made a JSFiddle for your reference Take a look jsfiddle.net/Harikrishna/ZX8ne/3

Mykola Prymak Over a year ago

You miss the search conditions array and i swap the for loops the working code is here jsfiddle.net/kbS76 But if you try to use it in real app - not forget to add the code to exclude duplicate records if necessary.

BeingNerd Over a year ago

Here I'm getting objects in list right.. How to access the values in that list...

|

Rajaprabhu Aravindasamy · Accepted Answer · 2014-01-02 12:36:55Z

2

Use a Json,

var xObj = {'A' : ['apple'] ,'B' : ['ball','balloon','bear'],'Ç' : ['cat','cow'] };

answered Jan 2, 2014 at 12:36

Rajaprabhu Aravindasamy

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1 Comment

BeingNerd Over a year ago

All I get is dynamic data.. I don't even know how many elements would be in a list. I will get a JSON Formatted data like {data:[{'key':'a',value:'apple'},{'key':'b',value:{'ball'},{'key':'b',value:'balloon'}]}

Hans · Accepted Answer · 2014-01-02 13:01:58Z

1

Here's an example:

/* Define dictionary */
var dict = {};

/* Define keys */
var keys = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";

/* Assign array as value for each key */
for (var n = 0; n < keys.length; n++) {
    dict[keys[n]] = [];
}

/* Make up a bunch of words */
var words = ["apple", "ball", "balloon", "bear", "cat", "cow"];

/* Append these words to the dictionary according to their first letter */
for (n = 0; n < words.length; n++) {
    dict[words[n][0].toUpperCase()].push(words[n]);
}

edited Jan 2, 2014 at 13:01

answered Jan 2, 2014 at 12:54

Hans

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