diff --git a/Maths/isDivisible.js b/Maths/IsDivisible.js
similarity index 57%
rename from Maths/isDivisible.js
rename to Maths/IsDivisible.js
index 072957e920..9c2ec81cf5 100644
--- a/Maths/isDivisible.js
+++ b/Maths/IsDivisible.js
@@ -1,11 +1,11 @@
// Checks if a number is divisible by another number.
-const isDivisible = (num1, num2) => {
- if (isNaN(num1) || isNaN(num2) || num1 == null || num2 == null) {
- return 'All parameters have to be numbers'
+export const isDivisible = (num1, num2) => {
+ if (!Number.isFinite(num1) || !Number.isFinite(num2)) {
+ throw new TypeError('Expected a number')
}
if (num2 === 0) {
- return 'Not possible to divide by zero'
+ return false
}
return num1 % num2 === 0
}
diff --git a/Maths/test/IsDivisible.test.js b/Maths/test/IsDivisible.test.js
new file mode 100644
index 0000000000..80ece0a0d7
--- /dev/null
+++ b/Maths/test/IsDivisible.test.js
@@ -0,0 +1,39 @@
+import { isDivisible } from '../IsDivisible'
+
+describe('isDivisible', () => {
+ const testCases = [
+ [0, 1, true],
+ [0, 2, true],
+ [1, 1, true],
+ [1, 2, false],
+ [2, 1, true],
+ [4, 4, true],
+ [16, 4, true],
+ [36978235, 5, true],
+ [36978235, 4, false],
+ [4.5, 1.5, true],
+ [4.5, 1.2, false],
+ [5, 0, false],
+ [5, -0, false]
+ ]
+
+ test.each(testCases)('if parameters are (%i, %i) it returns %p', (dividend, divisor, expected) => {
+ expect(isDivisible(dividend, divisor)).toBe(expected)
+ })
+
+ const errorCases = [
+ [NaN, NaN],
+ [NaN, 1],
+ [1, NaN],
+ ['1', 1],
+ [1, '1'],
+ [1, true],
+ [false, 2]
+ ]
+
+ test.each(errorCases)('throws an error if parameters are (%p, %p)', (dividend, divisor) => {
+ expect(() => {
+ isDivisible(dividend, divisor)
+ }).toThrow()
+ })
+})
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