如何使用every()循环/迭代二维数组？

Question

I cannot find a solution that uses method every(). I want to see if each coordinate (both x and y) is <= 10. So, the following example should return true.

Here is my code:

const shipLocation = [ [ 2, 3 ], [ 3, 3 ], [ 4, 3 ], [ 5, 3 ], [ 6, 3 ] ]
const outOfBounds = function (shipLocation) {
    Array.every(locationPoint => 
      // code here!
      locationPoint <= 10;
    );
  };

Thank you.

Answer 1

1. You need to return a value (boolean: true or false) from your function.

2. You have nested arrays so you need to use every on each of them and check that values inside those arrays are less or equal to 10 also by using every again, making sure you return true or false from that callback too.

 const shipLocation=[[2,1],[3,3],[4,3],[5,3],[6,3]] const shipLocation2=[[2,41],[3,3],[4,3],[5,3],[6,3]]; function outOfBounds(shipLocation) { // For every ship location array return shipLocation.every(arr => { // Return whether every value is <= 10 return arr.every(el => el <= 10); }); }; console.log(outOfBounds(shipLocation)); console.log(outOfBounds(shipLocation2));

Answer 2

const shipLocation = [ [ 2, 3 ], [ 3, 3 ], [ 4, 3 ], [ 5, 3 ], [ 6, 3 ] ]
const outOfBounds = shipLocation.every(cords=> (cords[0]<=10) && (cords[1]<=10))

Answer 3

• You can use the flat() function to make the 2d array into a 1d array:

 const shipLocation = [ [ 2, 3 ], [ 3, 3 ], [ 4, 3 ], [ 5, 3 ], [ 6, 3 ] ]; const outOfBounds = shipLocation.flat().every(locationPoint => locationPoint <= 10 // do not put ";" ); console.log(outOfBounds);