fp fns

Author: msa-ali

javascript-specific/functional-programming/auto-partial.js

@@ -0,0 +1,17 @@
+function autoPartial(fn) {
+    return function (...args) {
+        const totalArgsNeeded = fn.length;
+        if (args.length >= totalArgsNeeded) {
+            return fn(...args);
+        }
+        return autoPartial(fn.bind(null, ...args));
+    }
+}
+
+
+function _multiply(x, y, z) {
+    return x * y * z;
+}
+
+console.log(autoPartial(_multiply)(10)(8)(5));
+

javascript-specific/functional-programming/function-execution-time.js

@@ -0,0 +1,19 @@
+function measureExecutionTime(fn) {
+    return function(...args) {
+        console.time(fn.name);
+        const res = fn(...args);
+        console.timeEnd(fn.name);
+        return  res;
+    };
+}
+
+function _fib(n) {
+    if (n < 2) {
+        return n;
+    }
+    return fib(n-1) + fib(n-2);
+}
+
+const fib = measureExecutionTime(_fib);
+
+console.log(fib(30));

javascript-specific/functional-programming/print-function-name.js

@@ -0,0 +1,19 @@
+/**
+ * 
+ * @param {Function} fn 
+ * @returns 
+ */
+export function printOnInvoke(fn) {
+    return (...args) => {
+        console.log(fn.name, args);
+        return fn(...args);
+    }
+}
+
+function add(a, b) {
+    return a + b;
+}
+
+const updatedAdd = printOnInvoke(add);
+
+console.log(updatedAdd(10, 20));

…nal-programming/pure-functions/readme.md …pecific/functional-programming/readme.mdjavascript-specific/functional-programming/pure-functions/readme.md renamed to javascript-specific/functional-programming/readme.md javascript-specific/functional-programming/pure-functions/readme.md renamed to javascript-specific/functional-programming/readme.md

@@ -0,0 +1,33 @@
+function urlBuilder(protocol) {
+    return function (subdomain) {
+        return function (domain) {
+            return function (...paths) {
+                return function (params = {}) {
+                    const queryParams = Object.keys(params).reduce((query, curr, index) => query + `${index === 0 ? '' : '&'}${curr}=${params[curr]}`, '');
+                    let url = `${protocol}://${subdomain}.${domain}`;
+                    if (paths.length) {
+                        url += `/${paths.join('/')}`;
+                    }
+                    if (queryParams) {
+                        url += `?${queryParams}`
+                    }
+                    return url;
+                }
+            }
+        }
+    }
+}
+
+const http = urlBuilder('http');
+const https = urlBuilder('https');
+
+const www = https('www');
+const google = www('google.com');
+
+const path1 = google('some', 'path');
+const finalUrlWithParams = path1({
+    a: 10,
+    b: "hello",
+})
+
+console.log(finalUrlWithParams);