How do I check the internal contents of an array?

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How do I check the internal contents of an array?

For example:

var teste = [1, 2, 3, -4, 0]

How do I check that the internal content is less than 0 within the array?

javascript array
  • 1

    Do you need to check in all positions? If so, study the filter of arrays javascript.

  • 2

    I think the question is unclear. I thought he wanted to know if the array has more than 0 elements ("internal contents of the array")...

  • You want to know the internal sum of the array is less than or equal to 0 or if there is any value less than 0?

  • Sorry for the somewhat clear question, but I need to check the array items and if it is less than or equal to zero, if these numbers are greater than 2 do an action.

  • So if it is menor ou igual à 0 should an action be taken and if it is maior que 2 one must make another?

  • this, if it is less or equal returns true and otherwise returns false

  • Ask the question how you want the output to be.

  • "...I need to check the array items and if it is less than or equal to zero..." the syntax and semantic errors suggest a conflicting question, the "I need to check the array items" part suggests that you have to iterate and compare the items. The "if it is less than or equal to zero" part suggests that you do not need to iterate but use the array length.

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2 answers

0

face to check if the array returns empty, you can use the method length, the question is unclear. However, you can do the following.

var teste = [1, 2, 3, -4, 0]
if(teste.length > 0){
console.log('O array não é vazio')}
else{
console.log('Array Vazio')
}

0


You can use the method filter(), in which case it will go through the array and delete the positive numbers, the ones that will remain in the array are only the negative or zeroed.

const array = [-1, 0, 1, 2];
const qntNegativos = array.filter(nr => nr <= 0).length;

console.log(`Existe(m) ${qntNegativos} numero(s) negativo(s) ou  zerado(s).`)

Reference: filter()

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