diff --git a/src/differenceInArrays.js b/src/differenceInArrays.js
new file mode 100644
index 0000000..df115bf
--- /dev/null
+++ b/src/differenceInArrays.js
@@ -0,0 +1,4 @@
+const differenceInArrays = (array1, array2) =>  {
+    const set = new Set(array2);
+    return array1.filter(x => !set.has(x));
+};
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