Javascript 2d array indexOf

Question

I have a 2d array like this:

var arr = [[2,3],[5,8],[1,1],[0,9],[5,7]];

Each index stores an inner array containing the coordinates of some

Answer 1

Very simple without indexOf...

var arr = [[2,3],[5,8],[1,1],[0,9],[5,7]];
const isDup = (x,y) => {
   arr.find(it => JSON.stringify(it) == JSON.stringify([x,y])) == undefined ? arr.push([x,y]) : null
}

console.log(isDup(2,3)) /* Does not add */
console.log(isDup(1,2)) /*Does add*/
console.log(arr) /*Confirmation*/