javascript - How to add more in an object property based on the amount of digits in a number? -


this question has answer here:

sorry if title confusing.

i have object called question, contains property called brokenup. have randomly generated number. now, if number had 3 digits, want program add something. instance:

var arr = [400, 40, 2]; //really 442 broken up. var n= arr.length;

now main problem here:

question.brokenup = arr[0] + arr[1] + arr[2];

how can make line above work value?

what if had 4 digits? how can make arr[0]... arr[4] , on?

you use reduce this: 

var arr = [1,2,3,4] // whatever length;  var brokenup = arr.reduce(function(a, b) {return + b;}, ''); // empty string here

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