Add more post source code

Author: imteekay

external_file.js

@@ -0,0 +1,8 @@
+function charactersCounter(text) {
+  return `Character count: ${text.length}`;
+}
+
+function analyzeFile(filename) {
+  let fileContent = open(filename);
+  return charactersCounter(fileContent);
+}

increment_numbers.js

@@ -0,0 +1,7 @@
+let list = [1, 2, 3, 4, 5];
+
+function incrementNumbers(list) {
+  return list.map(number => number + 1);
+}
+
+console.log(incrementNumbers(list));

modifying_global_variable.js

@@ -0,0 +1,8 @@
+let counter = 1;
+
+function increaseCounter(value) {
+  counter = value + 1;
+}
+
+increaseCounter(counter);
+console.log(counter); // 2

pure_function.js

@@ -0,0 +1,7 @@
+const PI = 3.14;
+
+function calculateArea(radius, pi) {
+  return radius * radius * pi;
+}
+
+calculateArea(10, PI); // returns 314.0

random_number_generator.js

@@ -0,0 +1,7 @@
+function yearEndEvaluation() {
+  if (Math.random() > 0.5) {
+    return "You get a raise!";
+  } else {
+    return "Better luck next year!";
+  }
+}

recursive_sum.js

@@ -0,0 +1,14 @@
+let list = [1, 2, 3, 4, 5];
+let accumulator = 0;
+
+function sum(list, accumulator) {
+  if (list.length == 0) {
+    return accumulator;
+  }
+
+  return sum(list.slice(1), accumulator + list[0]);
+}
+
+console.log(sum(list, accumulator)); // 15
+console.log(list); // [1, 2, 3, 4, 5]
+console.log(accumulator); // 0

returns_increased_global_variable.js

@@ -0,0 +1,8 @@
+let counter = 1;
+
+function increaseCounter(value) {
+  return value + 1;
+}
+
+console.log(increaseCounter(counter)); // 2
+console.log(counter); // 1

slugify_composition.js

@@ -0,0 +1,10 @@
+let string = " I will be a url slug   ";
+
+function slugify(string) {
+  return string.toLowerCase()
+    .trim()
+    .split(" ")
+    .join("-");
+}
+
+console.log(slugify(string));