List Format

mediumcodingJavaScriptStrings~25 min

Asked at Google, Meta, Amazon

Overview

Implement listFormat(items, options) — formats an array into a grammatically correct string.

{ type: 'conjunction' } → uses "and" (default)
{ type: 'disjunction' } → uses "or"

Examples

listFormat(['a','b','c']); // 'a, b, and c'
listFormat(['a','b'], { type: 'disjunction' }); // 'a or b'

Solution

Reveal solution

function listFormat(items, options) {
  const word = (options?.type === 'disjunction') ? 'or' : 'and';
  if (items.length === 0) return '';
  if (items.length === 1) return items[0];
  if (items.length === 2) return `${items[0]} ${word} ${items[1]}`;
  return items.slice(0, -1).join(', ') + `, ${word} ` + items[items.length - 1];
}

list-format.js

List Format

mediumcodingJavaScriptStrings

Overview

Implement listFormat(items, options) — formats an array into a grammatically correct string.

{ type: 'conjunction' } → uses "and" (default)
{ type: 'disjunction' } → uses "or"

Examples

listFormat(['a','b','c']); // 'a, b, and c'
listFormat(['a','b'], { type: 'disjunction' }); // 'a or b'

Solution

Reveal solution

function listFormat(items, options) {
  const word = (options?.type === 'disjunction') ? 'or' : 'and';
  if (items.length === 0) return '';
  if (items.length === 1) return items[0];
  if (items.length === 2) return `${items[0]} ${word} ${items[1]}`;
  return items.slice(0, -1).join(', ') + `, ${word} ` + items[items.length - 1];
}

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