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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
Example:
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
.
+ Hint
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.
+ Solution
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;
}