data type practice note and example

Adam-7th-2 · Adam-7th-2 · commit 8cbc6723de19 · 2025-07-01T03:15:41.000+03:00
diff --git a/.history/pracrice/Data Types _20250701025212.js b/.history/pracrice/Data Types _20250701025212.js
diff --git a/.history/pracrice/Data Types _20250701025227.js b/.history/pracrice/Data Types _20250701025227.js
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+Lesson 
diff --git a/.history/pracrice/Data Types _20250701025229.js b/.history/pracrice/Data Types _20250701025229.js
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+Lesson 4
diff --git a/.history/pracrice/Data Types _20250701025231.js b/.history/pracrice/Data Types _20250701025231.js
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+Lesson 4: Data Types - JS
diff --git a/.history/pracrice/Data Types _20250701025235.js b/.history/pracrice/Data Types _20250701025235.js
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+// Lesson 4: Data Types - JS
diff --git a/.history/pracrice/Data Types _20250701025238.js b/.history/pracrice/Data Types _20250701025238.js
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+// Lesson 4: Data Types - JS
diff --git a/.history/pracrice/Data Types _20250701031038.js b/.history/pracrice/Data Types _20250701031038.js
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+// Lesson 4: Data Types - JS
+Primitive Data Types
diff --git a/.history/pracrice/Data Types _20250701031044.js b/.history/pracrice/Data Types _20250701031044.js
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+// Lesson 4: Data Types - JS
+1Primitive Data Types
diff --git a/.history/pracrice/Data Types _20250701031047.js b/.history/pracrice/Data Types _20250701031047.js
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+// Lesson 4: Data Types - JS
+1. Primitive Data Types
diff --git a/.history/pracrice/Data Types _20250701031051.js b/.history/pracrice/Data Types _20250701031051.js
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+// Lesson 4: Data Types - JS
+// 1. Primitive Data Types
diff --git a/.history/pracrice/Data Types _20250701031053.js b/.history/pracrice/Data Types _20250701031053.js
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+// Lesson 4: Data Types - JS
+// 1. Primitive Data Types
diff --git a/.history/pracrice/Data Types _20250701031100.js b/.history/pracrice/Data Types _20250701031100.js
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+// Lesson 4: Data Types - JS
+// 1. Primitive Data Types
+Primitive Data Types
diff --git a/.history/pracrice/Data Types _20250701031101.js b/.history/pracrice/Data Types _20250701031101.js
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+// Lesson 4: Data Types - JS
+// 1. Primitive Data Types
+ Primitive Data Types
diff --git a/.history/pracrice/Data Types _20250701031107.js b/.history/pracrice/Data Types _20250701031107.js
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+// Lesson 4: Data Types - JS
+// 1. Primitive Data Types
+// String - text inside quotes
+let name = "Henok";
+console.log(typeof name); // "string"
+
+// Number - integers or decimals
+let age = 25;
+let price = 99.99;
+console.log(typeof age);   // "number"
+console.log(typeof price); // "number"
+
+// Boolean - true or false
+let isOnline = true;
+console.log(typeof isOnline); // "boolean"
+
+// Undefined - declared but not assigned
+let country;
+console.log(typeof country); // "undefined"
+
+// Null - intentionally empty
+let emptyValue = null;
+console.log(typeof emptyValue); // "object" (weird JS behavior)
diff --git a/.history/pracrice/Data Types _20250701031109.js b/.history/pracrice/Data Types _20250701031109.js
@@ -0,0 +1,24 @@
+// Lesson 4: Data Types - JS
+// 1. Primitive Data Types
+// String - text inside quotes
+let name = "Henok";
+console.log(typeof name); // "string"
+
+// Number - integers or decimals
+let age = 25;
+let price = 99.99;
+console.log(typeof age);   // "number"
+console.log(typeof price); // "number"
+
+// Boolean - true or false
+let isOnline = true;
+console.log(typeof isOnline); // "boolean"
+
+// Undefined - declared but not assigned
+let country;
+console.log(typeof country); // "undefined"
+
+// Null - intentionally empty
+let emptyValue = null;
+console.log(typeof emptyValue); // "object" (weird JS behavior)
+
diff --git a/.history/pracrice/Data Types _20250701031117.js b/.history/pracrice/Data Types _20250701031117.js
@@ -0,0 +1,25 @@
+// Lesson 4: Data Types - JS
+// 1. Primitive Data Types
+// String - text inside quotes
+let name = "Henok";
+console.log(typeof name); // "string"
+
+// Number - integers or decimals
+let age = 25;
+let price = 99.99;
+console.log(typeof age);   // "number"
+console.log(typeof price); // "number"
+
+// Boolean - true or false
+let isOnline = true;
+console.log(typeof isOnline); // "boolean"
+
+// Undefined - declared but not assigned
+let country;
+console.log(typeof country); // "undefined"
+
+// Null - intentionally empty
+let emptyValue = null;
+console.log(typeof emptyValue); // "object" (weird JS behavior)
+
+
diff --git a/.history/pracrice/Data Types _20250701031120.js b/.history/pracrice/Data Types _20250701031120.js
@@ -0,0 +1,25 @@
+// Lesson 4: Data Types - JS
+// 1. Primitive Data Types
+// String - text inside quotes
+let name = "Henok";
+console.log(typeof name); // "string"
+
+// Number - integers or decimals
+let age = 22;
+let price = 99.99;
+console.log(typeof age);   // "number"
+console.log(typeof price); // "number"
+
+// Boolean - true or false
+let isOnline = true;
+console.log(typeof isOnline); // "boolean"
+
+// Undefined - declared but not assigned
+let country;
+console.log(typeof country); // "undefined"
+
+// Null - intentionally empty
+let emptyValue = null;
+console.log(typeof emptyValue); // "object" (weird JS behavior)
+
+
diff --git a/.history/pracrice/Data Types _20250701031125.js b/.history/pracrice/Data Types _20250701031125.js
@@ -0,0 +1,25 @@
+// Lesson 4: Data Types - JS
+// 1. Primitive Data Types
+// String - text inside quotes
+let name = "Henok";
+console.log(typeof name); // "string"
+
+// Number - integers or decimals
+let age = 22;
+let price = ;
+console.log(typeof age);   // "number"
+console.log(typeof price); // "number"
+
+// Boolean - true or false
+let isOnline = true;
+console.log(typeof isOnline); // "boolean"
+
+// Undefined - declared but not assigned
+let country;
+console.log(typeof country); // "undefined"
+
+// Null - intentionally empty
+let emptyValue = null;
+console.log(typeof emptyValue); // "object" (weird JS behavior)
+
+
diff --git a/.history/pracrice/Data Types _20250701031127.js b/.history/pracrice/Data Types _20250701031127.js
@@ -0,0 +1,25 @@
+// Lesson 4: Data Types - JS
+// 1. Primitive Data Types
+// String - text inside quotes
+let name = "Henok";
+console.log(typeof name); // "string"
+
+// Number - integers or decimals
+let age = 22;
+let price = 200;
+console.log(typeof age);   // "number"
+console.log(typeof price); // "number"
+
+// Boolean - true or false
+let isOnline = true;
+console.log(typeof isOnline); // "boolean"
+
+// Undefined - declared but not assigned
+let country;
+console.log(typeof country); // "undefined"
+
+// Null - intentionally empty
+let emptyValue = null;
+console.log(typeof emptyValue); // "object" (weird JS behavior)
+
+
diff --git a/.history/pracrice/Data Types _20250701031157.js b/.history/pracrice/Data Types _20250701031157.js
@@ -0,0 +1,26 @@
+// Lesson 4: Data Types - JS
+// 1. Primitive Data Types
+// String - text inside quotes
+let name = "Henok";
+console.log(typeof name); // "string"
+
+// Number - integers or decimals
+let age = 22;
+let price = 200;
+console.log(typeof age);   // "number"
+console.log(typeof price); // "number"
+
+// Boolean - true or false
+let isOnline = true;
+console.log(typeof isOnline); // "boolean"
+
+// Undefined - declared but not assigned
+let country;
+console.log(typeof country); // "undefined"
+
+// Null - intentionally empty
+let emptyValue = null;
+console.log(typeof emptyValue); // "object" (weird JS behavior)
+
+
+Non-Primitive Data Types
diff --git a/.history/pracrice/Data Types _20250701031204.js b/.history/pracrice/Data Types _20250701031204.js
@@ -0,0 +1,26 @@
+// Lesson 4: Data Types - JS
+// 1. Primitive Data Types
+// String - text inside quotes
+let name = "Henok";
+console.log(typeof name); // "string"
+
+// Number - integers or decimals
+let age = 22;
+let price = 200;
+console.log(typeof age);   // "number"
+console.log(typeof price); // "number"
+
+// Boolean - true or false
+let isOnline = true;
+console.log(typeof isOnline); // "boolean"
+
+// Undefined - declared but not assigned
+let country;
+console.log(typeof country); // "undefined"
+
+// Null - intentionally empty
+let emptyValue = null;
+console.log(typeof emptyValue); // "object" (weird JS behavior)
+
+
+2.Non-Primitive Data Types
diff --git a/.history/pracrice/Data Types _20250701031205.js b/.history/pracrice/Data Types _20250701031205.js
@@ -0,0 +1,26 @@
+// Lesson 4: Data Types - JS
+// 1. Primitive Data Types
+// String - text inside quotes
+let name = "Henok";
+console.log(typeof name); // "string"
+
+// Number - integers or decimals
+let age = 22;
+let price = 200;
+console.log(typeof age);   // "number"
+console.log(typeof price); // "number"
+
+// Boolean - true or false
+let isOnline = true;
+console.log(typeof isOnline); // "boolean"
+
+// Undefined - declared but not assigned
+let country;
+console.log(typeof country); // "undefined"
+
+// Null - intentionally empty
+let emptyValue = null;
+console.log(typeof emptyValue); // "object" (weird JS behavior)
+
+
+// 2.Non-Primitive Data Types
diff --git a/.history/pracrice/Data Types _20250701031207.js b/.history/pracrice/Data Types _20250701031207.js
@@ -0,0 +1,26 @@
+// Lesson 4: Data Types - JS
+// 1. Primitive Data Types
+// String - text inside quotes
+let name = "Henok";
+console.log(typeof name); // "string"
+
+// Number - integers or decimals
+let age = 22;
+let price = 200;
+console.log(typeof age);   // "number"
+console.log(typeof price); // "number"
+
+// Boolean - true or false
+let isOnline = true;
+console.log(typeof isOnline); // "boolean"
+
+// Undefined - declared but not assigned
+let country;
+console.log(typeof country); // "undefined"
+
+// Null - intentionally empty
+let emptyValue = null;
+console.log(typeof emptyValue); // "object" (weird JS behavior)
+
+
+// 2.Non-Primitive Data Types
diff --git a/.history/pracrice/Data Types _20250701031214.js b/.history/pracrice/Data Types _20250701031214.js
@@ -0,0 +1,38 @@
+// Lesson 4: Data Types - JS
+// 1. Primitive Data Types
+// String - text inside quotes
+let name = "Henok";
+console.log(typeof name); // "string"
+
+// Number - integers or decimals
+let age = 22;
+let price = 200;
+console.log(typeof age);   // "number"
+console.log(typeof price); // "number"
+
+// Boolean - true or false
+let isOnline = true;
+console.log(typeof isOnline); // "boolean"
+
+// Undefined - declared but not assigned
+let country;
+console.log(typeof country); // "undefined"
+
+// Null - intentionally empty
+let emptyValue = null;
+console.log(typeof emptyValue); // "object" (weird JS behavior)
+
+
+// 2.Non-Primitive Data Types
+// Object - key-value pairs
+let person = {
+     name: "Henok",
+     age: 25,
+     course: "CS"
+   };
+   console.log(typeof person); // "object"
+   
+   // Array - list of values
+   let numbers = [1, 2, 3, 4];
+   console.log(typeof numbers); // "object"
+   
diff --git a/.history/pracrice/Data Types _20250701031216.js b/.history/pracrice/Data Types _20250701031216.js
@@ -0,0 +1,39 @@
+// Lesson 4: Data Types - JS
+// 1. Primitive Data Types
+// String - text inside quotes
+let name = "Henok";
+console.log(typeof name); // "string"
+
+// Number - integers or decimals
+let age = 22;
+let price = 200;
+console.log(typeof age);   // "number"
+console.log(typeof price); // "number"
+
+// Boolean - true or false
+let isOnline = true;
+console.log(typeof isOnline); // "boolean"
+
+// Undefined - declared but not assigned
+let country;
+console.log(typeof country); // "undefined"
+
+// Null - intentionally empty
+let emptyValue = null;
+console.log(typeof emptyValue); // "object" (weird JS behavior)
+
+
+// 2.Non-Primitive Data Types
+// Object - key-value pairs
+let person = {
+     name: "Henok",
+     age: 25,
+     course: "CS"
+   };
+   console.log(typeof person); // "object"
+   
+   // Array - list of values
+   let numbers = [1, 2, 3, 4];
+   console.log(typeof numbers); // "object"
+   
+   
diff --git a/pracrice/Data Types .js b/pracrice/Data Types .js

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