Digit value to array in JavaScript -

i have number 8939, want array [8000,7000,6000,5000,4000,3000,2000,1000] , example if have 340 can array 300,200,100.

i knew , if user

i = i/1000 * 1000 

then can round down 8939 8000, don't know how can got result want above.

no reason complicate it, can use for loop

function getarrfornum(num){    var arr = []; // create new array    var digitnum = num.tostring().length; //get number of digits, can use math.log instead    var mulof10 = math.pow(10,digitnum-1);    for(var i=1;i*mulof10 < num;i++){        arr.push(i*mulof10); // push next multiple of 1000    }    return arr; //return } 

then can use it:

getarrfornum(3211); //1000,2000,3000 getarrfornum(321); //100,200,300 

here 1 line version challenge, suggest avoiding :)

array(+(832+"")[0]).join(".").split(".").map(function(_,i){ return (i+1)*math.pow(10,(832+"").length-1);}); // 800,700,600,500,400,300,200,100  array(+(3332+"")[0]).join(".").split(".").map(function(_,i){ return (i+1)*math.pow(10,(3332+"").length-1);}); //1000,2000,3000