Accessing a property using argument returns undefined

[colinthornton]

Well I’m glad you solved it. Do you feel you understand what was going wrong before? And do you understand how the solution works completely?

[Montin]

From my understanding my initial code didn’t work because the name property of some of the objects were in nested objects, so my condition of a.name === 'string' was not reaching them

[colinthornton]

Here’s what the requirements are:

Check if the predicate (second argument) is truthy on all elements of a collection (first argument).

Here’s what the previous code was solving:

Check if the name property is a string AND the predicate (second argument) is truthy on all elements of a collection (first argument).

Just kinda doing some unnecessary processing.

[colinthornton]

@Montin

function truthCheck(collection, pre) {
  let x = collection.map(a => typeof a.name === 'string' ? a[pre] : null)
  return x.every(e => Boolean(e))
}

By the way, just taking the conditional logic out of this makes it passing.

function truthCheck(collection, pre) {
  let x = collection.map(a => a[pre])
  return x.every(e => Boolean(e))
}

[Montin]

Ahh thanks a lot, this also answered my question of simply returning the values!