basic map in js 🗽🚀

Author: lgope

01 - JavaScript-Basics/map.js

@@ -0,0 +1,32 @@
+let sayings = new Map();
+sayings.set('dog', 'woof');
+sayings.set('cat', 'meow');
+sayings.set('elephant', 'toot');
+sayings.size; // 3
+sayings.get('fox'); // undefined
+sayings.has('bird'); // false
+sayings.delete('dog');
+sayings.has('dog'); // false
+
+for (let [key, value] of sayings) {
+  console.log(key + ' goes ' + value);
+}
+// "cat goes meow"
+// "elephant goes toot"
+
+sayings.clear();
+sayings.size; // 0
+
+let numbers = [4, 9, 20, 25, 29, 44, 88, 99];
+let num = numbers.map(Math.sqrt);
+
+console.log(num);
+
+let nums = [4, 9, 20, 25, 29, 44, 88, 99];
+let newarray = numbers.map(myFunction);
+
+function myFunction(num) {
+  return num * 10;
+}
+
+console.log(newarray);