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1

How to create Map<String,List<String>> in Javascript? Push method does not seem to work if we define 

aMap = {} and 
if(aMap [key])
{                                      
    aMap[key].push(value);//this is not working for some reason
}
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Thanks @Mark Pond for editing the code snippet –  Syed Amber Iqbal yesterday

1 Answer 1

up vote 3 down vote accepted

You have to create the key as an array, first.

var aMap = {};
function addValueToKey(key, value) {
    aMap[key] = aMap[key] || [];
    aMap[key].push(value);
}
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Thanks for the reply. This worked for me. var arr = []; arr.push(aMap[key]); arr.push(value); aMap[key]=arr; –  Syed Amber Iqbal yesterday
    
@SyedAmberIqbal You're adding null to the array, then adding the value, then finally putting it into the named slot. That's not correct. A "map" in JS is {}, and an "array" is []. Start from the function above. And, FYI, this really should have been on Stack Overflow, so it'll probably be moved anways. –  sfdcfox yesterday
    
Yeah that's right this should be the correct part of the code if(aMap[key]) { var arr = []; arr.push(aMap[key]); arr.push(value); aMap[key]=arr; } else{ aMap[key] = value; } –  Syed Amber Iqbal yesterday
    
@SyedAmberIqbal You're still wrapping your array inside itself once the key exists. Try using my code as a base for your tests, and your Map<String, List<String>> will work. –  sfdcfox yesterday

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