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rated 0 times [  126] [ 7]  / answers: 1 / hits: 59382  / 10 Years ago, tue, december 16, 2014, 12:00:00

My requirement is to store key-value pairs in a data structure and fetch or delete the pairs when necessary using keys in JavaScript.



How can I do it in JavaScript as one does it in Java?



I have seen an answer creating an instance of hash map like:



var hash={};


Now Ie can add values in it like:



hash={ January:1,Feb:2 }


Can I insert values dynamically using keys and fetch them and also get the size of the hash map?


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 Answers
75

Yes, that's an associative array (var hash = new Object();)



//You can add in these ways:



hash.January='1';

hash['Feb']='2';



//For length:

console.log(Object.keys(hash).length)



//To fetch by key:

console.log(hash['Feb']) // '2'



//To fetch all:

for(var key in hash){

    console.log('key is :' + key + ' and value is : '+ hash[key])

}

[#68467] Saturday, December 13, 2014, 10 Years  [reply] [flag answer]
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