add arr.sort

5.4ArrayMethod/t.js

@@ -34,4 +34,18 @@ console.log(someUsers);
 
 // arr.map(fn)
 let lengths = array.map(item=>item.length);
-alert(lengths);
+console.log(lengths);
+
+// arr.sort(fn)
+function compare(a, b){
+    if (a > b) return 1;
+    if (a == b) return 0;
+    if (a < b) return -1;
+}
+
+arr = [15, 2 ,1];
+console.log(`arr.sort(): ${arr.sort(compare)}`);
+console.log(`arr.sort(): ${arr.sort((a,b) => a - b)}`);
+
+let countries = ['Österreich', 'Andorra', 'Vietnam'];
+console.log(countries.sort((a,b) => a.localeCompare(b)))