How to create a dictionary of list in javascript

Question

I have a table as follows which I'm getting from a mysql database:

Col2   | Col3                   | Col4
1      | Name1(something_1234)  | Some_date
1      | Name1(something_3456)  | Some_date
2      | Name3(something_7890)  | Some_date
2      | Name4(something_0988)  | Some_date

And I'm getting this data into html using javascript as follows:

<script>
            var new_col2 = [], new_col3 =[];
            {% for b in obj %}
            new_col2.push("{{b.col2 }}");
            new_col3.push("{{b.col3 }}");
            {% endfor %}
            console.log(new_col2);
            console.log(new_col3);
    </script>

Is it possible to create a dictionary as follows using javascript using the above for loop:

{'1': ['Name1(something_1234)', 'Name1(something_3456)'], '2': 'Name3(something_7890)', 'Name4(something_0988)']}

huydq5000 · Accepted Answer · 2017-07-21 04:48:17Z

1

You can do something like this:

<script>
            var dictionary = {}
            {% for b in obj %}
                if (!dictionary["{{b.col2 }}"]) {
                    dictionary["{{b.col2 }}"] = [];
                }
                dictionary["{{b.col2 }}"].push({{b.col3 }});
            {% endfor %}
            console.log(dictionary);            
</script>

answered Jul 21, 2017 at 4:48

huydq5000

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Comments

Munzer · Accepted Answer · 2017-07-21 05:05:23Z

0

Assuming that obj is javascript list of object we can loop through the list, and push each row into the map we will create, if you don't know map, check this

something like this.

var myMap= new Map();
obj.forEach(function(element) {
   // my map set (key , value )
    myMap.set(element.col2,element.col3);
});

you can access the value of key 1 myMap.get(1);, this will return the value mapped with key 1.

answered Jul 21, 2017 at 5:05

Munzer

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