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Challenge 65: String Count

curriculum/challenges/english/blocks/daily-coding-challenges-javascript/68cae5b538ff798bbd4da003.md

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--description--

Given two strings, determine how many times the second string appears in the first.

  • The pattern string can overlap in the first string. For example, "aaa" contains "aa" twice. The first two a's and the second two.

--hints--

count('abcdefg', 'def') should return 1.

js
assert.equal(count('abcdefg', 'def'), 1);

count('hello', 'world') should return 0.

js
assert.equal(count('hello', 'world'), 0);

count('mississippi', 'iss') should return 2.

js
assert.equal(count('mississippi', 'iss'), 2);

count('she sells seashells by the seashore', 'sh') should return 3.

js
assert.equal(count('she sells seashells by the seashore', 'sh'), 3);

count('101010101010101010101', '101') should return 10.

js
assert.equal(count('101010101010101010101', '101'), 10);

--seed--

--seed-contents--

js
function count(text, pattern) {

  return text;
}

--solutions--

js
function count(text, pattern) {
  let occurrences = 0;

  for (let i = 0; i <= text.length - pattern.length; i++) {
    if (text.slice(i, i + pattern.length) === pattern) {
      occurrences++;
    }
  }

  return occurrences;
}