refactor: apply suggestions from code review

---
type: pre_commit_static_analysis_report
description: Results of running static analysis checks when committing changes.
report:
  - task: lint_filenames
    status: passed
  - task: lint_editorconfig
    status: passed
  - task: lint_markdown
    status: na
  - task: lint_package_json
    status: na
  - task: lint_repl_help
    status: na
  - task: lint_javascript_src
    status: passed
  - task: lint_javascript_cli
    status: na
  - task: lint_javascript_examples
    status: na
  - task: lint_javascript_tests
    status: passed
  - task: lint_javascript_benchmarks
    status: na
  - task: lint_python
    status: na
  - task: lint_r
    status: na
  - task: lint_c_src
    status: na
  - task: lint_c_examples
    status: na
  - task: lint_c_benchmarks
    status: na
  - task: lint_c_tests_fixtures
    status: na
  - task: lint_shell
    status: na
  - task: lint_typescript_declarations
    status: passed
  - task: lint_typescript_tests
    status: na
  - task: lint_license_headers
    status: passed
---

Author: headlessNode

lib/node_modules/@stdlib/string/base/slice-grapheme-clusters/docs/types/index.d.ts

@@ -34,10 +34,10 @@
 * // returns '👋👋'
 *
 * out = sliceGraphemeClusters( 'अनुच्छेद', 1, 3 );
-* // returns 'नु'
+* // returns 'नुच्'
 *
 * out = sliceGraphemeClusters( 'Hello World', -5, -1 );
-* // returns 'World'
+* // returns 'Worl'
 */
 declare function sliceGraphemeClusters( str: string, start: number, end: number ): string;
 

lib/node_modules/@stdlib/string/base/slice-grapheme-clusters/lib/main.js

@@ -28,7 +28,7 @@ var max = require( '@stdlib/math/base/special/fast/max' );
 // MAIN //
 
 /**
-* Slice a string based on grapheme cluster (i.e., user-perceived character) indices.
+* Slices a string based on grapheme cluster (i.e., user-perceived character) indices.
 *
 * @param {string} str - input string
 * @param {integer} start - the `ith` grapheme cluster to start a slice (inclusive)
@@ -58,47 +58,36 @@ function sliceGraphemeClusters( str, start, end ) {
 	if ( str === '' ) {
 		return '';
 	}
-
 	numClusters = numGraphemeClusters( str );
-
 	if ( start < 0 ) {
 		start = max( start + numClusters, 0 );
 	}
-
 	if ( end < 0 ) {
 		end = max( end + numClusters, 0 );
 	}
-
 	if ( start >= numClusters || start >= end ) {
 		return '';
 	}
-
 	if ( end > numClusters ) {
 		end = numClusters;
 	}
-
 	result = '';
 	idx = 0;
 	i = 0;
-
 	while ( idx < str.length ) {
 		brk = nextGraphemeClusterBreak( str, idx );
 		if ( brk === -1 ) {
 			brk = str.length;
 		}
-
 		if ( i >= start && i < end ) {
 			result += str.substring( idx, brk );
 		}
-
 		idx = brk;
 		i += 1;
-
 		if ( i >= end ) {
 			break;
 		}
 	}
-
 	return result;
 }
 

lib/node_modules/@stdlib/string/base/slice-grapheme-clusters/test/test.js

@@ -45,7 +45,7 @@ tape( 'the function returns an empty string if provided an empty input string',
 	t.end();
 });
 
-tape( 'the function returns an empty string if starting index is greater than or equal to ending index', function test( t ) {
+tape( 'the function returns an empty string if the starting index is greater than or equal to the ending index', function test( t ) {
 	var out;
 
 	out = sliceGraphemeClusters( 'hello', 2, 2 );
@@ -57,7 +57,7 @@ tape( 'the function returns an empty string if starting index is greater than or
 	t.end();
 });
 
-tape( 'the function returns an empty string if starting index is greater than or equal to string length', function test( t ) {
+tape( 'the function returns an empty string if the starting index is greater than or equal to the string length', function test( t ) {
 	var out;
 
 	out = sliceGraphemeClusters( 'hello', 5, 6 );
@@ -90,6 +90,21 @@ tape( 'the function slices an input string based on grapheme cluster indices', f
 	t.end();
 });
 
+tape('the function slices an input string based on grapheme cluster indices (skin-tone emojis)', function test(t) {
+	var out;
+
+	out = sliceGraphemeClusters('🌷👨‍👩‍👧‍👦👉🏿', 1, 2);
+	t.strictEqual(out, '👨‍👩‍👧‍👦', 'returns expected value');
+
+	out = sliceGraphemeClusters('🏝️👨‍👩‍👧‍👦', 1, 2);
+	t.strictEqual(out, '👨‍👩‍👧‍👦', 'returns expected value');
+
+	out = sliceGraphemeClusters('👋🏾🤦🏽‍♀️🧑🏿', 1, 2);
+	t.strictEqual(out, '🤦🏽‍♀️', 'returns expected value');
+
+	t.end();
+});
+
 tape( 'the function supports providing negative indices', function test( t ) {
 	var out;
 
@@ -111,6 +126,21 @@ tape( 'the function supports providing negative indices', function test( t ) {
 	t.end();
 });
 
+tape('the function supports providing negative indices (skin-tone emojis)', function test(t) {
+	var out;
+
+	out = sliceGraphemeClusters( '🌷👨‍👩‍👧‍👦👉🏿', -2, -1 );
+	t.strictEqual( out, '👨‍👩‍👧‍👦', 'returns expected value' );
+
+	out = sliceGraphemeClusters( '🏝️👨‍👩‍👧‍👦', -1, 4 );
+	t.strictEqual( out, '👨‍👩‍👧‍👦', 'returns expected value' );
+
+	out = sliceGraphemeClusters( '👋🏾🤦🏽‍♀️🧑🏿‍🦱', -2, -1 );
+	t.strictEqual( out, '🤦🏽‍♀️', 'returns expected value' );
+
+	t.end();
+});
+
 tape( 'the function truncates the end index to the string length', function test( t ) {
 	var out;