Run results for: deep freeze vs deep clone

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:134.0) Gecko/20100101 Firefox/134.0

Browser: Firefox 134

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
✓ deepFreeze	5,828,570 Ops/sec
deepClone	754,113 Ops/sec

Script Preparation code:

function deepClone (obj) {
  const result = {}

  for (const key in obj) {
    const value = obj[key]

    if (value !== null && typeof value === 'object') {
      result[key] = deepClone(value)
    } else {
      result[key] = value
    }
  }

  return result
}

function deepFreeze (obj) {
  for (const key in obj) {
    const value = obj[key]

    if (value !== null && typeof value === 'object') {
      if (Object.isFrozen(value) === false) {
        deepFreeze(value)
      }
    }
  }

  return Object.freeze(obj)
}

var source = {
  foo: 'foo',
  bar: 'bar',
  baz: 'baz',
  qux: {
    foo: 'foo',
    bar: 'bar',
    baz: 'baz',
    qux: {
      foo: 'foo',
      bar: 'bar',
      baz: 'baz',
      qux: {
        foo: 'foo',
        bar: 'bar',
        baz: 'baz',
        qux: 'qux'
      }
    }
  }
}

Run results for: deep freeze vs deep clone

can be used in similar ways when you want immutable data

deepFreeze

deepClone