core-functions - npm Package Compare versions

Comparing version 2.0.3 to 2.0.4

package.json

 {
   "name": "core-functions",
-  "version": "2.0.3",
+  "version": "2.0.4",
   "description": "Core functions, utilities and classes for working with Node/JavaScript primitives and built-in objects, including strings, booleans, Promises, base 64, Arrays, Objects, standard AppErrors, etc.",
@@ -5,0 +5,0 @@ "author": "Byron du Preez",

README.md

@@ -1,2 +0,2 @@
-# core-functions v2.0.3
+# core-functions v2.0.4
 
@@ -106,2 +106,6 @@ Core functions, utilities and classes for working with Node/JavaScript primitives and built-in objects, including
 
+### 2.0.4
+- Change to `strings.js`:
+    - Added an `nthIndexOf` function that finds index of nth occurrence of a search value in a string
+
 ### 2.0.3
@@ -108,0 +112,0 @@ - Change to `promises.js`:

strings.js

@@ -28,2 +28,3 @@ 'use strict';
   stringify: stringify,
+  nthIndexOf: nthIndexOf
 };
@@ -95,1 +96,25 @@
 }
+
+/**
+ * Returns the index of the nth occurrence of the given searchValue in the given string (if any); otherwise returns -1.
+ * @param {string} s - the string to search
+ * @param {string} searchValue - the value to search for in the string
+ * @param {number} nth - the number of occurrences to traverse through to find the nth occurrence
+ * @returns {number} the index of the nth occurrence of the given searchValue in the given string (if any); otherwise returns -1
+ */
+function nthIndexOf(s, searchValue, nth) {
+  if (nth < 1) return -1;
+  let index = 0;
+  for (let i = 0; i < nth; ++i) {
+    if (i > 0) {
+      index += searchValue.length;
+    }
+
+    index = s.indexOf(searchValue, index);
+
+    if (index === -1) {
+      break;
+    }
+  }
+  return index;
+}

test/package.json

 {
   "name": "core-functions-tests",
-  "version": "2.0.3",
+  "version": "2.0.4",
   "author": "Byron du Preez",
@@ -5,0 +5,0 @@ "license": "Apache-2.0",

test/strings.test.js

@@ -526,1 +526,35 @@ 'use strict';
 });
+
+test('nthIndexOf', t => {
+  const s = 'arn:aws:dynamodb:us-east-1:111111111111:table/test/stream/2020-10-10T08:18:22.385';
+  //         0----+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8
+  t.equal(Strings.nthIndexOf(s, ':', -1), -1, `nthIndexOf(':', -1) must be -1`);
+  t.equal(Strings.nthIndexOf(s, ':', 0), -1, `nthIndexOf(':', 0) must be -1`);
+  t.equal(Strings.nthIndexOf(s, ':', 1), 3, `nthIndexOf(':', 1) must be 3`);
+  t.equal(Strings.nthIndexOf(s, ':', 2), 7, `nthIndexOf(':', 2) must be 7`);
+  t.equal(Strings.nthIndexOf(s, ':', 3), 16, `nthIndexOf(':', 3) must be 16`);
+  t.equal(Strings.nthIndexOf(s, ':', 4), 26, `nthIndexOf(':', 4) must be 26`);
+  t.equal(Strings.nthIndexOf(s, ':', 5), 39, `nthIndexOf(':', 5) must be 39`);
+  t.equal(Strings.nthIndexOf(s, ':', 6), 71, `nthIndexOf(':', 6) must be 71`);
+  t.equal(Strings.nthIndexOf(s, ':', 7), 74, `nthIndexOf(':', 7) must be 74`);
+  t.equal(Strings.nthIndexOf(s, ':', 8), -1, `nthIndexOf(':', 8) must be -1`);
+  t.equal(Strings.nthIndexOf(s, ':', 9), -1, `nthIndexOf(':', 9) must be -1`);
+
+  t.equal(Strings.nthIndexOf(s, 'table', 0), -1, `nthIndexOf('table', 0) must be -1`);
+  t.equal(Strings.nthIndexOf(s, 'table', 1), 40, `nthIndexOf('table', 1) must be 40`);
+  t.equal(Strings.nthIndexOf(s, 'table', 2), -1, `nthIndexOf('table', 2) must be -1`);
+
+  t.equal(Strings.nthIndexOf(s, '/', 0), -1, `nthIndexOf('/', 0) must be -1`);
+  t.equal(Strings.nthIndexOf(s, '/', 1), 45, `nthIndexOf('/', 1) must be 45`);
+  t.equal(Strings.nthIndexOf(s, '/', 2), 50, `nthIndexOf('/', 2) must be 50`);
+  t.equal(Strings.nthIndexOf(s, '/', 3), 57, `nthIndexOf('/', 3) must be 57`);
+  t.equal(Strings.nthIndexOf(s, '/', 4), -1, `nthIndexOf('/', 4) must be -1`);
+
+  t.equal(Strings.nthIndexOf(s, '', -1), -1, `nthIndexOf('', -1) must be -1`);
+  t.equal(Strings.nthIndexOf(s, '', 0), -1, `nthIndexOf('', 0) must be -1`);
+  t.equal(Strings.nthIndexOf(s, '', 1), 0, `nthIndexOf('', 1) must be 0`);
+  t.equal(Strings.nthIndexOf(s, '', 2), 0, `nthIndexOf('', 2) must be 0`);
+  t.equal(Strings.nthIndexOf(s, '', 100), 0, `nthIndexOf('', 100) must be 0`);
+
+  t.end();
+});

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Improved metrics

Total package byte prevSize

168032

increased by1.89%

Lines of code

3352

increased by1.48%

Number of lines in readme file

150

increased by2.74%

No dependency changes