Add examples

Author: tshemsedinov

JavaScript/1-inconsistent.js

@@ -0,0 +1,16 @@
+'use strict';
+
+const inconsistent = (a, b) => {
+  if (a < 0) return false;
+  if (b > 9) return b;
+  if (a === b) return -1;
+  const result = a + b;
+  if (typeof result === 'number') return result;
+};
+
+const y1 = inconsistent(-1, 7);
+const y2 = inconsistent(5, 20);
+const y3 = inconsistent(5, 5);
+const y4 = inconsistent(5, 7);
+const y5 = inconsistent(5, '7');
+console.log({ y1, y2, y3, y4, y5 });

JavaScript/2-consistent.js

@@ -0,0 +1,45 @@
+'use strict';
+
+const inconsistent = (a, b) => {
+  if (a < 0) throw new Error('Expected positive "a"');
+  if (b > 9) return b;
+  if (a === b) return -1;
+  const result = a + b;
+  if (typeof result === 'number') return result;
+  throw new Error('Result is not number');
+};
+
+try {
+  const y1 = inconsistent(-1, 7);
+  console.log({ y1 });
+} catch (error) {
+  console.error(error.message);
+}
+
+try {
+  const y2 = inconsistent(5, 20);
+  console.log({ y2 });
+} catch (error) {
+  console.error(error.message);
+}
+
+try {
+  const y3 = inconsistent(5, 5);
+  console.log({ y3 });
+} catch (error) {
+  console.error(error.message);
+}
+
+try {
+  const y4 = inconsistent(5, 7);
+  console.log({ y4 });
+} catch (error) {
+  console.error(error.message);
+}
+
+try {
+  const y5 = inconsistent(5, '7');
+  console.log({ y5 });
+} catch (error) {
+  console.error(error.message);
+}

JavaScript/3-initial.js

@@ -0,0 +1,13 @@
+'use strict';
+
+const f = ({ a, b }, callback) => {
+  if (a < 0) return callback(0);
+  if (b > 9) return callback(100);
+  if (a === b) return callback(-1);
+  callback(b - a);
+};
+
+f({ a: 5, b: 7 }, (res) => {
+  console.log(res);
+  if (res === 1) return res;
+});

JavaScript/4-return.js

@@ -0,0 +1,22 @@
+'use strict';
+
+const f = ({ a, b }, callback) => {
+  if (a < 0) {
+    callback(0);
+    return;
+  }
+  if (b > 9) {
+    callback(100);
+    return;
+  }
+  if (a === b) {
+    callback(-1);
+    return;
+  }
+  callback(b - a);
+};
+
+f({ a: 5, b: 7 }, (res) => {
+  console.log(res);
+  if (res === 1) return res;
+});

JavaScript/5-void.js

@@ -0,0 +1,13 @@
+'use strict';
+
+const f = ({ a, b }, callback) => {
+  if (a < 0) return void callback(0);
+  if (b > 9) return void callback(100);
+  if (a === b) return void callback(-1);
+  void callback(b - a);
+};
+
+f({ a: 5, b: 7 }, (res) => {
+  console.log(res);
+  if (res === 1) return res;
+});