From 972a004706c87811a1710607d2ab3c03ac9e0145 Mon Sep 17 00:00:00 2001
From: mhrooz <cxyoz@outlook.com>
Date: Fri, 21 Jun 2024 23:03:35 +0200
Subject: [PATCH] 5.8 object functions

---
 5.8objectkeys/main.py |  0
 5.8objectkeys/t.js    | 44 +++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 44 insertions(+)
 create mode 100644 5.8objectkeys/main.py
 create mode 100644 5.8objectkeys/t.js

diff --git a/5.8objectkeys/main.py b/5.8objectkeys/main.py
new file mode 100644
index 0000000..e69de29
diff --git a/5.8objectkeys/t.js b/5.8objectkeys/t.js
new file mode 100644
index 0000000..a7c7836
--- /dev/null
+++ b/5.8objectkeys/t.js
@@ -0,0 +1,44 @@
+
+console.log("====================object.keys, values, entries====================")
+
+console.log("Object function, you must call Object.keys but not obj.keys")
+console.log("Object.keys(obj) - returns an array of keys")
+console.log("Object.values(obj) - returns an array of values")
+console.log("Object.entries(obj) - returns an array of [key, value] pair")
+console.log("Object.fromEntries(array) - on the resulting array to turn it back into an object")
+
+let prices = {
+    banana : 4,
+    orange : 2,
+    meat : 1,
+}
+console.log(`Object.entries(prices): ${Object.entries(prices)}`)
+
+let doubleprices = Object.fromEntries(
+    Object.entries(prices).map(entry => [entry[0], entry[1] * 2])
+);
+console.log(`Object.entries(doubleprices): ${Object.entries(doubleprices)}`)
+
+Object.values(prices).reduce((sum, cur)=> sum+cur, 0)
+
+function sumSalaries(salaries ){
+    return Object.values(salaries).reduce((sum, cur) => sum + cur, 0);
+}
+
+let salaries = {
+    "John": 100,
+    "Pete": 300,
+    "Mary": 250
+};
+
+console.log(sumSalaries(salaries));
+
+function count(user){
+    return Object.keys(user).length;
+}
+
+let user = {
+    name : "John",
+    age: 30
+};
+console.log(count(user));
\ No newline at end of file