JavaScript how to get index for specific coordinate in array?

[developpersoft]

good day

please Could some to show me how to get index of the coordinate in array like this

let arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]];
//I want to know the index of [7,8,9];
//I use arr.indexOf([7,8,9]) but the result was -1

 

[Antero360]

good day

please Could some to show me how to get index of the coordinate in array like this

let arr = [[1, 2, 3], [4, 5, 6], [7, 8, 9]];
//I want to know the index of [7,8,9];
//I use arr.indexOf([7,8,9]) but the result was -1

Hi there,
One thing you can try is instead of using indexOf, use findIndex() instead. You're going to have to also add a condition checking for a) the type the element is, and b) the simplest way to compare array content, without looping through is convert to a string. See below

let myArray = [[1, 2], [3, 4, 5], [6, 7, 9]];
var target = [3, 4, 5].toString();
var index = myArray.findIndex(element => Array.isArray(element) && element.toString === target);
console.log(index);

 

[developpersoft]

Hi there,
One thing you can try is instead of using indexOf, use findIndex() instead. You're going to have to also add a condition checking for a) the type the element is, and b) the simplest way to compare array content, without looping through is convert to a string. See below

let myArray = [[1, 2], [3, 4, 5], [6, 7, 9]];
var target = [3, 4, 5].toString();
var index = myArray.findIndex(element => Array.isArray(element) && element.toString === target);
console.log(index);

same result

 

[Padonak]

const myArray = [[1, 2], [3, 4, 5], [6, 7, 9]],
      target = [6, 7, 9].join(''),
      index = myArray.findIndex(element => Array.isArray(element) && element.join('') === target);
    
console.log( index ); // 2

 

[Antero360]

same result

It shouldn't. I tested this in the live console via inspector in browser lol. But I did find one thing wrong with my code 😉 in the findIndex() function... what is wrong with the toString call? 😉

 

[developpersoft]

const myArray = [[1, 2], [3, 4, 5], [6, 7, 9]],
      target = [6, 7, 9].join(''),
      index = myArray.findIndex(element => Array.isArray(element) && element.join('') === target);
   
console.log( index ); // 2

Thank you