JSON Stringify

mediumcodingJavaScriptRecursionStrings~25 min

Asked at Google, Amazon

Overview

Implement jsonStringify(value) that serializes a value to a JSON string.

Constraints

Handle: strings, numbers, booleans, null, arrays, plain objects
Do not use JSON.stringify
Strings must be double-quoted

Examples

jsonStringify({ a: 1, b: 'hello' }); // '{"a":1,"b":"hello"}'
jsonStringify([1, null, true]); // '[1,null,true]'

Solution

Reveal solution

function jsonStringify(value) {
  if (value === null) return 'null';
  if (typeof value === 'boolean') return value ? 'true' : 'false';
  if (typeof value === 'number') return String(value);
  if (typeof value === 'string') return '"' + value.replace(/\\/g,'\\\\').replace(/"/g,'\\"') + '"';
  if (Array.isArray(value)) return '[' + value.map(v => jsonStringify(v)).join(',') + ']';
  if (typeof value === 'object') {
    const pairs = Object.keys(value).map(k => jsonStringify(k) + ':' + jsonStringify(value[k]));
    return '{' + pairs.join(',') + '}';
  }
  return undefined;
}

json-stringify.js

JSON Stringify

mediumcodingJavaScriptRecursion

Overview

Implement jsonStringify(value) that serializes a value to a JSON string.

Constraints

Handle: strings, numbers, booleans, null, arrays, plain objects
Do not use JSON.stringify
Strings must be double-quoted

Examples

jsonStringify({ a: 1, b: 'hello' }); // '{"a":1,"b":"hello"}'
jsonStringify([1, null, true]); // '[1,null,true]'

Solution

Reveal solution

function jsonStringify(value) {
  if (value === null) return 'null';
  if (typeof value === 'boolean') return value ? 'true' : 'false';
  if (typeof value === 'number') return String(value);
  if (typeof value === 'string') return '"' + value.replace(/\\/g,'\\\\').replace(/"/g,'\\"') + '"';
  if (Array.isArray(value)) return '[' + value.map(v => jsonStringify(v)).join(',') + ']';
  if (typeof value === 'object') {
    const pairs = Object.keys(value).map(k => jsonStringify(k) + ':' + jsonStringify(value[k]));
    return '{' + pairs.join(',') + '}';
  }
  return undefined;
}

NameTopicDifficulty

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