On Aug 3, 2016, at 7:43 PM, Tippur wrote:
> Changed it to
>
> ##########
> 'use strict'
>
> var str='{ \
>
> "a": ["x", "y"], \
>
> "rest": "fdsf", \
>
> "ff": "ll" \
>
> }'
>
>
>
> var jsonstr=JSON.parse(str);
>
>
>
> var payload=[];
>
>
>
> if (Array.isArray(jsonstr['a'])){
>
>
>
> console.log("Is array");
>
>
>
> var payload=[];
>
>
>
> jsonstr['a'].forEach(function(item, index) {
>
>
>
> console.log(item);
>
> var jsontemp=jsonstr;
Here, you're making jsontemp a reference to the same block of memory used by
jsonstr. Later, when you modify jsontemp.a, it's the same as modifying
jsonstr.a. Then later, when you push jsontemp onto the payload array, you're
pushing a reference to that same jsontemp / jsonstr block of memory. Since
that's in a forEach it happens multiple times, but each time, you're pushing a
reference to the same block of memory onto the array, which is why when you
print the array later, every item is the same, and has the values from the last
loop iteration.
The fix is to make jsontemp an actual copy of jsonstr, with its own memory that
you can modify independently, e.g.:
var jsontemp=Object.assign({}, jsonstr);
> jsontemp.a=item;
>
>
>
> console.log(jsontemp);
>
>
>
> payload.push(jsontemp);
>
>
> });
>
>
>
> }
>
>
>
> console.log(payload);
>
>
>
> ####################
>
>
>
> i get the same result.
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