Safely access nested value in Immutable.js structure

Question

I'm considering introducing Immutable JS in an existing React project. The project is littered with deeply nested references, wrapped with the selectn utility.

For example:

// returns order.id or undefined if product or order or id are undefined
if(selectn('product.order.id',this.state)) {
  //...
}

Is there an Immutable JS API method to check a deeply nested structure, and return either the requested property or undefined?

kevin628 · Accepted Answer · 2016-02-19 23:56:01Z

3

Here's an example.

var t = Immutable.fromJS({a: { aa: { aaa: 'thing' } } });

I want a.aa.aaa.

t.getIn(['a','aa','aaa']);
// returns "thing"

What if I try to get a.aa.bbb?

t.getIn(['a', 'aa', 'bbb']);
// Returns undefined.

Here's the API for getIn(): getIn() API.

answered Feb 19, 2016 at 23:56

kevin628

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