diff --git a/DIRECTORY.md b/DIRECTORY.md
index b2cf2520f4..79f79d9423 100644
--- a/DIRECTORY.md
+++ b/DIRECTORY.md
@@ -116,6 +116,7 @@
* [PrimeCheck](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/PrimeCheck.js)
* [ReversePolishNotation](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/ReversePolishNotation.js)
* [SieveOfEratosthenes](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/SieveOfEratosthenes.js)
+ * [Softmax](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/Softmax.js)
* test
* [Abs](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/Abs.test.js)
* [Area](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/Area.test.js)
@@ -141,6 +142,7 @@
* [PrimeCheck](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/PrimeCheck.test.js)
* [ReversePolishNotation](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/ReversePolishNotation.test.js)
* [SieveOfEratosthenes](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/SieveOfEratosthenes.test.js)
+ * [Softmax](https://github.com/TheAlgorithms/Javascript/blob/master/Maths/test/Softmax.test.js)
## Navigation
* [Haversine](https://github.com/TheAlgorithms/Javascript/blob/master/Navigation/Haversine.js)
diff --git a/Maths/Softmax.js b/Maths/Softmax.js
new file mode 100644
index 0000000000..baeb9fad36
--- /dev/null
+++ b/Maths/Softmax.js
@@ -0,0 +1,13 @@
+// Wikipedia: https://en.wikipedia.org/wiki/Softmax_function
+
+const Softmax = (inputs) => {
+ const eulerExpOfAllInputs = inputs.map(input => Math.exp(input))
+ const sumOfEulerExpOfAllInputs = eulerExpOfAllInputs.reduce((a, b) => a + b)
+
+ return inputs.map((input) => {
+ const eulerExpInputs = Math.exp(input)
+ return eulerExpInputs / sumOfEulerExpOfAllInputs
+ })
+}
+
+export { Softmax }
diff --git a/Maths/test/Softmax.test.js b/Maths/test/Softmax.test.js
new file mode 100644
index 0000000000..179697bcf7
--- /dev/null
+++ b/Maths/test/Softmax.test.js
@@ -0,0 +1,12 @@
+import { Softmax } from '../Softmax'
+
+describe('Softmax', () => {
+ it('should return equal distribution of 1 for equal input values', () => {
+ expect(Softmax([1, 1])).toEqual([0.5, 0.5])
+ expect(Softmax([1, 1, 1, 1])).toEqual([0.25, 0.25, 0.25, 0.25])
+ })
+
+ it('should return values which sum to the value of 1', () => {
+ expect(Softmax([1, 2, 3, 4]).reduce((a, b) => a + b, 0)).toEqual(1)
+ })
+})
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