Javascript - 处理多维数组

Question

Arrayinarray=[];
let options = driver.findElements(By.css("[section='trim'] select"));
options.then(swap=>{
    swap.map((key)=>{
        var s=key.findElements(By.css("option"));
        s.then(mt=>{
            Arrayinarray.push(mt)
        })
    })

});

this is my selenium code.

I have to get each element of the array in correct order

For example.

var Arrayinarray=[[1,2,3],[4,5,6,5],[7,8,9],[1,6,3],[1,5,7][1,2,2],[7,2,9,3]];

Expected output:

1471117 1471112 1471119 1471113 1471127 1471122
1471129 1471123 1471127 1471122 1471129 1471123
...

I have to permutate the combination of this multidimensional array. I placed many for loops and map functions. However, it does not work.

Answer 1

You could take a iterative approach by collecting all part arrays and take the final arrays for getting a number back.

 var values = [[1, 2, 3], [4, 5, 6, 5], [7, 8, 9], [1, 6, 3], [1, 5, 7], [1, 2, 2], [7, 2, 9, 3]], result = values .reduce((a, b) => a.reduce((r, v) => r.concat(b.map(w => [].concat(v, w))), [])) .map(s => +s.join('')); console.log(result);

 .as-console-wrapper { max-height: 100% !important; top: 0; }

Answer 2

The number of results can quickly grow large. In your case it will have 3*4*3*3*3*3*4 results, ie 3888 results, but making some of the sub arrays larger, and/or adding more of them multiplies the number of results quickly.

You could use a generator function and then select the first X results from it, or all of them (which I do below):

 function * generateCombis(arr) { if (arr.length === 1) return yield * arr[0]; const shift = 10**(arr.length-1); for (let val of arr[0]) { for (let val2 of generateCombis(arr.slice(1))) yield val*shift+val2 } } // Example var Arrayinarray=[[1,2,3],[4,5,6,5],[7,8,9],[1,6,3],[1,5,7], [1,2,2],[7,2,9,3]]; const result = Array.from(generateCombis(Arrayinarray)); console.log(result);

Using the spread syntax, you could make the function take the subarrays as separate arguments (instead of taking a nested array), which makes some parts of the code more readable (but that is debatable):

 function * generateCombis(current, ...rest) { if (!rest.length) return yield * current; const shift = 10**rest.length; for (let val of current) { for (let val2 of generateCombis(...rest)) yield val*shift+val2 } } // Example var Arrayinarray=[[1,2,3],[4,5,6,5],[7,8,9],[1,6,3],[1,5,7], [1,2,2],[7,2,9,3]]; const result = Array.from(generateCombis(...Arrayinarray)); console.log(result);