Javascript: How to use array value as key?

Question

console.log of an array ($myarray) returns this:

[ RowDataPacket { name: 'Foo', value: 1 },
  RowDataPacket { name: 'Bar', value: 3 } ]

How can I convert the array to make it possible to have the name available as key?

At the end console.log($myarray[Bar]) should return: 3

What is RowDataPacket? How are you constructing this array? Try providing some code in the form of a minimal reproducible example. — Quentin
– Quentin, Commented May 8, 2017 at 14:58
The RowDataPacket comes from the result of a mysql return. github.com/mysqljs/mysql — Deltahost
– Deltahost, Commented May 8, 2017 at 15:02

Lennholm · Accepted Answer · 2017-05-08 15:06:32Z

4

What you want is to convert your array into an object. Use the reduce() function to iterate over each item in the array, process it and mutate the accumulator object that will be returned as the resulting object.

$myarray.reduce(function(obj, item) {
    obj[item.name] = item.value;
    return obj;
}, {});

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/Reduce

edited May 8, 2017 at 15:06

answered May 8, 2017 at 14:55

Lennholm

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3 Comments

George Over a year ago

I've given you an upvote because your code does seem to work but could you add some detail on what it's doing and if possible why it works.

Pointy Over a year ago

Generally code-only answers are less helpful than they could be with added explanation.

Lennholm Over a year ago

Code first, explain later!

Nair Athul · Accepted Answer · 2017-05-08 14:57:40Z

0

I think you can search using filter and return 0th element like

var array = [ { name: 'Foo', value: 1 },
  { name: 'Bar', value: 3 } ]

var result =  array.filter(i=>i.name=='Bar')[0]
console.log(result)

answered May 8, 2017 at 14:57

Nair Athul

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