在JS中转换数组

Question

Help, please.

How is it possible in JS to transform these arrays:

$ar1 = array('Shop 1', 15, 25, 30);
$ar2 = array('Shop 2', 25, 45, 50);
$ar3 = array('Month', 1, 2, 3);

to this:

$values = array(
   array('Month', 'Shop 1', 'Shop 2'),
   array('1', 15, 25),
   array('2', 25, 45),
   array('3', 30, 50),
);

in PHP I can do it as follow:

$result = array_map(function($a,$b,$c){ return [$a,$b,$c]; }, $ar3,$ar1,$ar2);

or like that:

function flip($arr) {
$result = array();
foreach ($arr as $index => $list) {
    foreach ($list as $key => $value) {
        $result[$key][$index] = $value;
    }
}
return $result;
}

$values = flip([$ar3, $ar1, $ar2]);

Answer 1

You can use Array.prototype.map in Javascript. It passes the array index as an argument to the callback, which you can then use to access the other two arrays.

var arr1 = ['Shop 1', 15, 25, 30];
var arr2 = ['Shop 2', 25, 45, 50];
var arr3 = ['Month', 1, 2, 3];

var result = arr3.map(function(element, index) {
  return [element, arr1[index], arr2[index]];
});

console.log(result);

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