javascript相当于数组的php max

Question

I have a function in php that selects the array with that contains the most elements.

$firstArray = array('firstArray','blah','blah','blah');
$secondArray = array('secondArray','blah','blah');
$thirdArray = array('thirdArray','blah','blah','blah','blah');

then I get the name of the variable with the highest length like this:

$highest = max($firstArray, $secondArray, $thirdArray)[0];

but I am developing an application and I want to avoid using php and I have tried javascript's Math.max() to achieve the same results but it doesn't work the same way unless I do

Math.max(firstArray.length, secondArray.length, thirdArray.length)

But this is useless since I need to know the name of the array that contains the most elements. Is there any other way to achieve this?

Answer 1

This function takes as input an array of arrays, and returns the largest one.

function largestArray(arrays){
   var largest;
   for(var i = 0; i < arrays.length; i++){
       if(!largest || arrays[i].length > largest.length){
          largest = arrays[i];
       }
   }
   return largest;
}

We can test it out with your example:

firstArray = ['firstArray','blah','blah','blah'];
secondArray = ['secondArray','blah','blah'];
thirdArray = ['thirdArray','blah','blah','blah','blah'];

// should print the third array
console.log(largestArray([firstArray, secondArray, thirdArray]));