Text Search

mediumcodingJavaScriptStringsAlgorithms~25 min

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Overview

Implement textSearch(text, pattern) that returns an array of starting indices where pattern appears in text.

Examples

textSearch('ababab', 'ab'); // [0, 2, 4]
textSearch('hello', 'xyz'); // []

Solution

Reveal solution

function textSearch(text, pattern) {
  if (!pattern) return [];
  const indices = [];
  let idx = text.indexOf(pattern);
  while (idx !== -1) {
    indices.push(idx);
    idx = text.indexOf(pattern, idx + 1);
  }
  return indices;
}

text-search.js

Text Search

mediumcodingJavaScriptStrings

Overview

Implement textSearch(text, pattern) that returns an array of starting indices where pattern appears in text.

Examples

textSearch('ababab', 'ab'); // [0, 2, 4]
textSearch('hello', 'xyz'); // []

Solution

Reveal solution

function textSearch(text, pattern) {
  if (!pattern) return [];
  const indices = [];
  let idx = text.indexOf(pattern);
  while (idx !== -1) {
    indices.push(idx);
    idx = text.indexOf(pattern, idx + 1);
  }
  return indices;
}

NameTopicDifficulty

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