feat: add helper for selecting text slice

src/utils/text/excerpt-content.js

@@ -1,7 +1,20 @@
-export default function excerptContent(content, words = 10) {
+export function excerptContent(content, words = 10) {
   return content
     .trim()
     .split(/\s+/)
     .slice(0, words)
     .join(' ');
 }
+
+export function excerptContentRange(content, start, end) {
+  return content
+    .trim()
+    .split(/\s+/)
+    .slice(start, end)
+    .join(' ');
+}
+
+export default {
+  excerptContent,
+  excerptContentRange,
+};

src/utils/text/excerpt.test.js

@@ -1,5 +1,5 @@
 import assert from 'assert';
-import excerptContent from './excerpt-content';
+import { excerptContent } from './excerpt-content';
 
 describe('excerptContent(content, words)', () => {
   it('extracts the requested number of words from content', () => {

src/utils/text/index.js

@@ -4,5 +4,5 @@ export { default as pageNumFromUrl } from './page-num-from-url';
 export { default as removeAnchor } from './remove-anchor';
 export { default as articleBaseUrl } from './article-base-url';
 export { default as hasSentenceEnd } from './has-sentence-end';
-export { default as excerptContent } from './excerpt-content';
+export { excerptContent, excerptContentRange } from './excerpt-content';
 export { default as getEncoding } from './get-encoding';