array | obj shorthand technique.

lgope · lgope · commit 1785462d4be7 · 2020-02-25T23:08:28.000+06:00
diff --git a/js-coding-technique/array-find.js b/js-coding-technique/array-find.js
@@ -0,0 +1,20 @@
+// Longhand:
+
+const pets = [
+  { type: 'Dog', name: 'tommy' },
+  { type: 'Cat', name: 'miu' },
+  { type: 'Dog', name: 'maxxian' }
+];
+
+function findDog(name) {
+  for (let i = 0; i < pets.length; ++i) {
+    if (pets[i].type === 'Dog' && pets[i].name === name) {
+      return pets[i];
+    }
+  }
+}
+
+// Shorthand:
+
+pet = pets.find(pet => pet.type === 'Dog' && pet.name === 'tommy');
+console.log(pet); // { type: 'Dog', name: 'tommy' }
diff --git a/js-coding-technique/obj-key.js b/js-coding-technique/obj-key.js
@@ -0,0 +1,35 @@
+// longhand
+function validate(values) {
+  if (!values.first) return false;
+  if (!values.last) return false;
+  return true;
+}
+
+console.log(validate({ first: 'Bruce', last: 'Wayne' })); // true
+
+// Shorthand:
+
+// object validation rules
+const schema = {
+  first: {
+    required: true
+  },
+  last: {
+    required: true
+  }
+};
+
+// universal validation function
+const validate = (schema, values) => {
+  for (field in schema) {
+    if (schema[field].required) {
+      if (!values[field]) {
+        return false;
+      }
+    }
+  }
+  return true;
+};
+
+console.log(validate(schema, { first: 'Bruce' })); // false
+console.log(validate(schema, { first: 'Bruce', last: 'Wayne' })); // true
