index.js
function getChildren(tile) {
    return [
        [tile[0] * 2, tile[1] * 2, tile[2] + 1],
        [tile[0] * 2 + 1, tile[1] * 2, tile[2 ] + 1],
        [tile[0] * 2 + 1, tile[1] * 2 + 1, tile[2] + 1],
        [tile[0] * 2, tile[1] * 2 + 1, tile[2] + 1]
    ];
}
function getChildren(tile) {
    return [
        [tile[0] * 2, tile[1] * 2, tile[2] + 1],
        [tile[0] * 2 + 1, tile[1] * 2, tile[2 ] + 1],
        [tile[0] * 2 + 1, tile[1] * 2 + 1, tile[2] + 1],
        [tile[0] * 2, tile[1] * 2 + 1, tile[2] + 1]
    ];
}
function getChildren ( tile ) { return [ [ tile [ 0 ] * 2 , tile [ 1 ] * 2 , tile [ 2 ] + 1 ] , [ tile [ 0 ] * 2 + 1 , tile [ 1 ] * 2 , tile [ 2 ] + 1 ] , [ tile [ 0 ] * 2 + 1 , tile [ 1 ] * 2 + 1 , tile [ 2 ] + 1 ] , [ tile [ 0 ] * 2 , tile [ 1 ] * 2 + 1 , tile [ 2 ] + 1 ] ] ; }
Get the 4 tiles one zoom level higher

@name getChildren
@param {Array<number>} tile
@returns {Array<Array<number>>} tiles
@example
var tiles = getChildren([5, 10, 10])
//=tiles
Get the 4 tiles one zoom level higher