delete: repeated negative examples

Author: danieldanielecki

data/blog/software-development/web-development/frontend/javascript/slice-vs-substring-vs-substr-complete-javascript-string-methods-comparison.mdx

@@ -243,24 +243,12 @@ console.log(str.slice(-3, -6));    // "" (empty string)
 //   End: -6 becomes 10 - 6 = 4
 //   Result: str.slice(7, 4) which is empty (7 > 4)
 
-// Case 9: Positive start, negative end
-console.log(str.slice(0, -1));     // "JavaScrip" (all except last character)
-// Explanation:
-//   Start: 0
-//   End: -1 becomes 10 - 1 = 9
-//   Result: str.slice(0, 9) which gives "JavaScrip" (indices 0-8)
+// Case 9: Positive start (not 0), negative end
 console.log(str.slice(4, -3));    // "Scri" (from index 4 to -3, which is position 7)
 // Explanation:
 //   Start: 4
 //   End: -3 becomes 10 - 3 = 7
 //   Result: str.slice(4, 7) which gives "Scri" (indices 4-6)
-
-// Case 10: Negative start, positive end
-console.log(str.slice(-4, 10));    // "ript" (last 4 characters)
-// Explanation:
-//   Start: -4 becomes 10 - 4 = 6
-//   End: 10 (clamped to string.length)
-//   Result: "ript" (indices 6, 7, 8, 9)
 ```
 
 ### `slice()` with Negative Indices Explained (Visual Guide)
@@ -604,17 +592,7 @@ console.log(str.slice(-3, -6));         // "" (empty string)
 // Both return empty, but for different reasons:
 // substring() treats both negatives as 0, slice() converts them and finds 7 > 4
 
-// Case 9: Positive start, negative end
-console.log(str.substring(0, -1));     // "" (empty string)
-// Step-by-step:
-// 1. startIndex = 0
-// 2. endIndex = -1 → treated as 0
-// 3. Check: 0 > 0? NO → No swap
-// 4. Extract: indices from 0 to 0 (exclusive) → ""
-// Equivalent to: str.substring(0, 0)
-// Comparison with slice():
-console.log(str.slice(0, -1));          // "JavaScrip" (from index 0 to -1, which is position 9)
-// slice() correctly interprets negative end, substring() treats negative end as 0
+// Case 9: Positive start (not 0), negative end
 console.log(str.substring(4, -3));     // "Java"
 // Step-by-step:
 // 1. startIndex = 4
@@ -626,18 +604,6 @@ console.log(str.substring(4, -3));     // "Java"
 // Comparison with slice():
 console.log(str.slice(4, -3));          // "Scri" (from index 4 to -3, which is position 7)
 // slice() correctly interprets negative end (7), substring() treats negative end as 0 and swaps
-
-// Case 10: Negative start, positive end
-console.log(str.substring(-4, 10));     // "JavaScript" (entire string)
-// Step-by-step:
-// 1. startIndex = -4 → treated as 0
-// 2. endIndex = 10
-// 3. Check: 0 > 10? NO → No swap
-// 4. Extract: indices 0-9 → entire string "JavaScript"
-// Equivalent to: str.substring(0, 10)
-// Comparison with slice():
-console.log(str.slice(-4, 10));         // "ript" (from index -4 which is position 6, to 10)
-// slice() correctly interprets negative start (6), substring() treats negative start as 0
 ```
 
 #### Argument Swapping Behavior (The Quirky Part!)