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# do...while loop

The `do...while` loop works similarly to the `while` loop. The loop code is executed as long as the loop condition results in `true`. The only difference is that the loop condition is checked after the loop code. This ensures that the loop code is run through at least once.
``````let threeX = '';
do {
threeX = threeX + 'x';
} while (threeX.length < 3);``````
After the loop `threeX` has the value `'xxx'`.

## Exercise

Write a function `lcm` that takes two natural numbers and calculates their least common multiple (lcm). The lcm of two natural numbers a und b is the smallest natural number that is divisible by a and b.

Example: `lcm(4, 6)` should return `12`.
To calculate the lcm of a and b, take `1` and test whether it is divisible by a and b. If so, `1` is the lcm. If not, take `2` and test again. And so forth.
``````function lcm(a, b) {

let theLCM = 0;
let remainderA;
let remainderB;

do {

theLCM++;
remainderA = theLCM % a;
remainderB = theLCM % b;

} while (remainderA !== 0 || remainderB !== 0)

return theLCM;
}``````