How to check if an array of arrays contains an empty array in my selector?

Question

I have a selector that is selecting the array of arrays

export const doesArrayContainEmptyArray = createSelector(
    getTestState,
    (state: TestState) => state.selectedTemplate?.plate.map(p => p.plateTest.map(pt => pt?.columnValues))
);

In my .ts file I have an observable that calls the selector

    doesArrayContainEmptyArray$ = this.store.pipe(select(doesArrayContainEmptyArray));

I console logged it out like this

    this.doesArrayContainEmptyArray$.subscribe(a=> console.log("array: ", a));

In the console I see:

[Array(4)]
   0: Array(4)
      0: ['test']
      1: []
      2: []
      3: []

I want the selector to return false if it the array contains an array that is empty and true if all inner arrays have values

waterically · Accepted Answer · 2022-09-09 20:21:07Z

1

general solution:

arr.every(subarr => subarr.length)

answered Sep 9, 2022 at 20:21

waterically

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1 Comment

Sirth Over a year ago

What is every? a ramda function?

Kelum Bandara · Accepted Answer · 2022-09-10 06:16:00Z

you can also use the javascript array operation some to get the value

For additional operations see

Since you have your function named doesArrayContainEmptyArray we want to return true when the array of arrays contains an empty and vise versa. Assuming your selectedTemplate structure as follows

 {
   "plate": [
       {
          "plateTest": [
              {
                 "columnValues": ['test']
              },
              {
                 "columnValues": []
              }
           ]
       }
    ]

}


export const doesArrayContainEmptyArray = createSelector(
    getTestState,
    (state: TestState) => state.selectedTemplate?.plate.some(p => p.plateTest.some(pt => pt?.columnValues?.length === 0));
);

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