Compare each element of the array to state with react

Question

Hi i dont't know how to compare each elements of the array to the state:

doesCustomerExist = () => {
  const { customers } = this.props;
  let result = customers.map(c => c.phone)
  if(result === this.state.phone)
    return (console.log('already exist'))
    console.log(result)
}

is this.state.phone an array or a single element (string)? — mez
– mez, Commented Jun 11, 2019 at 13:47
Please edit the question with more information. Which var is the array you wanna compare? Put in comments the value of the state and the log of 'result'. — Nico Diz
– Nico Diz, Commented Jun 11, 2019 at 13:53

remeus · Accepted Answer · 2019-06-11 13:53:38Z

1

You can use indexOf to check if an array contains a given element.

For instance:

const phone = "123";
const customers = ["111", "222", "333", "123"];

const isInArray = customers.indexOf(phone) > -1;

console.log(isInArray);

answered Jun 11, 2019 at 13:53

remeus

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Comments

Akrion · Accepted Answer · 2019-06-11 16:46:35Z

1

For this simply use Array.inlcudes:

const phone = "123";
const customers = ["111", "222", "333", "123"];

const isFound = customers.includes(phone)

console.log(isFound);

answered Jun 11, 2019 at 16:46

Akrion

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