# The way to Clear up the Grouped by Commas Problem in Javascript

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## The problem#

End the answer in order that it takes an enter n (integer) and returns a string that’s the decimal illustration of the quantity grouped by commas after each 3 digits.

Assume: 0 <= n < 2147483647

Examples:

1  ->           "1"
10  ->          "10"
100  ->         "100"
1000  ->       "1,000"
10000  ->      "10,000"
100000  ->     "100,000"
1000000  ->   "1,000,000"
35235235  ->  "35,235,235"

Choice 1:

perform groupByCommas(n) {
return n.toLocaleString()
}

Choice 2:

perform groupByCommas(n) {
return n.toString().change(/B(?=(d{3})+(?!d))/g, ",");
}

Choice 3:

perform groupByCommas(n) {
var s = n.toString(),
r = [];
s = reverse(s);
for (var i = 0, l = s.size; i < l; i += 3) {
r.push(s.substr(i, 3));
}
return reverse(r.be part of(','));
}
perform reverse(s) {
return s.cut up('').reverse().be part of('');
}

## Take a look at circumstances to validate our answer#

describe("Exams", () => {
it("take a look at", () => {
Take a look at.assertEquals(groupByCommas(1), '1');
Take a look at.assertEquals(groupByCommas(10), '10');
Take a look at.assertEquals(groupByCommas(100), '100');
Take a look at.assertEquals(groupByCommas(1000), '1,000');
Take a look at.assertEquals(groupByCommas(10000), '10,000');
Take a look at.assertEquals(groupByCommas(100000), '100,000');
Take a look at.assertEquals(groupByCommas(1000000), '1,000,000');
Take a look at.assertEquals(groupByCommas(35235235), '35,235,235');
});
});