Dynamically handle string and array in code

Question

Datatype of stack id either can be an array or a string.

In the below code stack[0].id is Array and stack[1].id is string.

Issue is stackConfig is undefined when id is returned as array.

How do i handle this dynamically?

let stack = [{id:['stack1','stack2']},{id:'stack2'}]
let stackConfig = this.stackConfigs.find(c => c.id === selectionId);

Just check if typeof c.id === 'string' to distinguish between the cases — Aleksey L.
– Aleksey L., Commented Mar 5, 2018 at 8:15

Giannis Mp · Accepted Answer · 2018-03-05 08:16:03Z

2

You could try something like this:

let stack = [{id:['stack1','stack3']},{id:'stack2'},{id:'stack4'}]
let selectionId = 'stack2';
let stackConfig = stack.find(c => { 
  if(Array.isArray(c.id)) { if (c.id.indexOf(selectionId) != -1) return true;}
  else { return c.id === selectionId }
  return false;
});
console.log(stackConfig);

answered Mar 5, 2018 at 8:16

Giannis Mp

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David · Accepted Answer · 2018-03-05 08:18:56Z

0

The first thing you should do is check whether c.id === selectionId is true at any point. This might never be true, hence why it is undefined.

You could try to handle having the selectionId also undefined as follows:

if (c.id.indexOf(selectionId) != -1) return true;

answered Mar 5, 2018 at 8:18

David

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