Function as value

Author: imteekay

javascript/function_as_value.js

@@ -0,0 +1,18 @@
+const sum = (a, b) => a + b;
+const subtraction = (a, b) => a - b;
+
+const doubleSum = (a, b) => sum(a, b) * 2;
+const doubleSubtraction = (a, b) => subtraction(a, b) * 2;
+
+const doubleOperator = (f, a, b) => f(a, b) * 2;
+
+doubleOperator(sum, 1, 1);
+doubleOperator(subtraction, 3, 1);
+
+const doubleOperator = (f) => (a, b) => f(a, b) * 2;
+
+const doubleSum = doubleOperator(sum);
+const doubleSubtraction = doubleOperator(subtraction);
+
+doubleSum(1, 1);
+doubleSubtraction(3, 1);