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Truncate a String

curriculum/challenges/english/blocks/basic-algorithm-scripting/ac6993d51946422351508a41.md

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--description--

Truncate a string (first argument) if it is longer than the given maximum string length (second argument). Return the truncated string with a ... ending.

--hints--

truncateString("A-tisket a-tasket A green and yellow basket", 8) should return the string A-tisket....

js
assert.strictEqual(
  truncateString('A-tisket a-tasket A green and yellow basket', 8),
  'A-tisket...'
);

truncateString("Peter Piper picked a peck of pickled peppers", 11) should return the string Peter Piper....

js
assert.strictEqual(
  truncateString('Peter Piper picked a peck of pickled peppers', 11),
  'Peter Piper...'
);

truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length) should return the string A-tisket a-tasket A green and yellow basket.

js
assert.strictEqual(
  truncateString(
    'A-tisket a-tasket A green and yellow basket',
    'A-tisket a-tasket A green and yellow basket'.length
  ),
  'A-tisket a-tasket A green and yellow basket'
);

truncateString("A-tisket a-tasket A green and yellow basket", "A-tisket a-tasket A green and yellow basket".length + 2) should return the string A-tisket a-tasket A green and yellow basket.

js
assert.strictEqual(
  truncateString(
    'A-tisket a-tasket A green and yellow basket',
    'A-tisket a-tasket A green and yellow basket'.length + 2
  ),
  'A-tisket a-tasket A green and yellow basket'
);

truncateString("A-", 1) should return the string A....

js
assert.strictEqual(truncateString('A-', 1), 'A...');

truncateString("Absolutely Longer", 2) should return the string Ab....

js
assert.strictEqual(truncateString('Absolutely Longer', 2), 'Ab...');

--seed--

--seed-contents--

js
function truncateString(str, num) {
  return str;
}

truncateString('A-tisket a-tasket A green and yellow basket', 8);

--solutions--

js
function truncateString(str, num) {
  if (num >= str.length) {
    return str;
  }

  return str.slice(0, num) + '...';
}

truncateString('A-tisket a-tasket A green and yellow basket', 8);