Stringify not working when storing named array in localstorage

Question

I have named arrays that I want store in local storage.

For example:

testla=[];

testla['aaaa']='a';

However, when I try:

console.log(JSON.stringify(testla));

This outputs:

[]

And even more weird, when using:

testla=[];

testla[10]='a';

I get strange results like this:

[null,null,null,null,null,null,null,null,null,null,"a"]

According to docs, localstorage can only store strings, therefore stringifying makes sense to me, but apparently it doesn't work, so there must be other way of doing this.

"I have named arrays" - no you don't, because that's not a thing. stackoverflow.com/questions/874205/… — C3roe
– C3roe, Commented May 13, 2017 at 22:15

Alex · Accepted Answer · 2017-05-13 22:17:57Z

1

JSON.stringify() ignores non-array properties of arrays. But you can use objects: var testla = {}; .

edited May 13, 2017 at 22:17

answered May 13, 2017 at 22:11

Alex

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1 Comment

Anonymous Over a year ago

I use objects to store other variables but I want to achieve this with named arrays particularly.

dashton · Accepted Answer · 2017-05-13 22:31:20Z

1

In the first example you are just adding a property call aaa to your object. Same as

testla.aaaa = 'foo';

You can create an associative array by using an object as so :

var myArr = {};
myArr['aaaa'] = 'bar';

There is no such thing as a named array, arrays in js can only be indexed using numbers.

answered May 13, 2017 at 22:31

dashton

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