Unable to employ the .some() method with an array consisting of objects

I am currently attempting to determine whether my array of objects contains an attribute with a specific value. I wanted to use the array.some() method instead of a foreach loop, but I keep encountering an error:

Error TS2345: Argument of type '(element: ListaDetalhePendenciaAprovacao) => void' is not assignable to parameter of type '(value: ListaDetalhePendenciaAprovacao, index: number, array: ListaDetalhePendenciaAprovacao[]) => boolean'. Type 'void' is not assignable to type 'boolean'.

The code snippet causing the issue is as follows:

   let existeApr = this.pendenciasList.some(element =>{
      !isUndefined(element.isSelected) && element.isSelected
    })

   let existeRej = this.pendenciasList.some(element =>{
      !isUndefined(element.isSelected) && element.isSelected
    })

I am facing a similar problem with array.findIndex(). I apologize for the attributes being in my native language, I hope it does not cause any confusion. Thank you in advance!

Answer №1

The reason for this issue is the presence of curly braces in the callback function that is being passed to some. When using curly braces, a boolean value must be returned from it:

let existeApr = this.pendenciasList.some(element =>{
  return !isUndefined(element.isSelected) && element.isSelected
})

However, for a concise one-liner like yours, you can eliminate the curly braces and simplify it like this:

let existeApr = this.pendenciasList.some(element =>
  !isUndefined(element.isSelected) && element.isSelected)

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