Call a function in an array foreach loop with nested data

Question

The following obviously doesn't work but it is the goal I am trying to reach:

items.forEach(addData(item.data));

I know I can do:

items.forEach(function(item){
    addData(item.data)
});

but I was wondering if there was a shorthand / cooler way of doing this.

edit:

I am also calling the same add data function with an array of items that aren't nested like so:

items.forEach(addItemId)

Which is why I was trying to find a way to use the same function (in a similar) fashion for the nested object.

I don't think there's any shorthand in regular Javascript. Libraries like underscore.js and lodash probably have ways to do it. — Barmar
– Barmar, Commented Dec 22, 2016 at 19:44
iirc cant you bind the function argument to a function @Barmar? — Sterling Archer
– Sterling Archer, Commented Dec 22, 2016 at 19:45
@SterlingArcher How would that automatically get the .data property of every element of the array? — Barmar
– Barmar, Commented Dec 22, 2016 at 19:45
You could adjust the addData function to look for .data :P — Sterling Archer
– Sterling Archer, Commented Dec 22, 2016 at 19:46

Sterling Archer · Accepted Answer · 2016-12-22 19:57:36Z

1

Use an ES6 feature: Lambdas.

items.forEach(item => addData(item.data));

I'm trying to find a way to use .bind here, but to be honest, this is a pretty clean way. One liner, shorthand for function() { }.

answered Dec 22, 2016 at 19:57

Sterling Archer

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3 Comments

tengbretson Over a year ago

How about a little items.forEach(({ data }) => addData(data));

Sterling Archer Over a year ago

Is that fancy destructuring I see?

tengbretson Over a year ago

Thats right. Whats the point of programming if you don't get to make yourself feel clever? haha

Mathew Berg · Accepted Answer · 2016-12-22 19:51:57Z

0

If you can update your function to use item instead of item.data you could do this:

items.forEach(addData);

This will call addData with each item, not item.data though

answered Dec 22, 2016 at 19:51

Mathew Berg

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1 Comment

Sterling Archer Over a year ago

While this is true, Barmar had a good point that this doesn't generalize the solution. OP might not want to do that and is looking for a way to bind the item.data param, not item

tengbretson · Accepted Answer · 2016-12-22 20:16:35Z

0

I don't necessarily recommend doing this in production code, but you can accomplish something like this with a little combinator:

const map_into = k => fn => o => fn(o[k]);

items.forEach(map_into('data')(addData));

answered Dec 22, 2016 at 20:16

tengbretson

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