[Benchmark]: Deep Cloning Objects

Libraries Tested

• clone-deep v0.2.4
• clone-extend v0.1.2
• clone v2.1.0
• cloneextend v0.0.3
• component-clone v0.2.3
• deep-copy v1.1.2
• deepcopy v0.6.1
• deepclone v1.0.2
• extend v3.0.0
• fast-clone v1.4.2
• lodash v4.17.2
• stringify-clone v2.0.0 - this is just a wrapper around JSON.parse(JSON.stringify())
• structured-clone v0.2.2
• utils-copy v1.1.1
• ~~node-v8-clone v0.6.2~~ uses a C++ extension, does not work with node > v0.12.x
• ~~safe-clone-deep v1.1.2~~ stopped working with node >= v5.x

Results

Node.js v7.2.x (Dec, 13, 2016)

Fastest

  deep-copy        x 205,619 ops/sec ±1.82% (94 runs sampled)

Slowest

  utils-copy       x  14,985 ops/sec ±1.00% (93 runs sampled)

Results

  clone            x  23,682 ops/sec ±1.03% (90 runs sampled)
  clone-deep       x  42,803 ops/sec ±2.08% (89 runs sampled)
  clone-extend     x  17,618 ops/sec ±0.80% (91 runs sampled)
  cloneextend      x  40,788 ops/sec ±0.88% (92 runs sampled)
  component-clone  x  60,881 ops/sec ±1.37% (96 runs sampled)
  deep-copy        x 205,619 ops/sec ±1.82% (94 runs sampled)
  deepclone        x  24,356 ops/sec ±2.34% (90 runs sampled)
  deepcopy         x  24,833 ops/sec ±0.80% (95 runs sampled)
  extend           x  52,284 ops/sec ±0.73% (88 runs sampled)
  fast-clone       x  31,181 ops/sec ±1.68% (84 runs sampled)
  lodash.cloneDeep x  29,568 ops/sec ±1.41% (89 runs sampled)
  stringify-clone  x  51,015 ops/sec ±1.71% (88 runs sampled)
  structured-clone x  35,505 ops/sec ±0.75% (92 runs sampled)
  utils-copy       x  14,985 ops/sec ±1.00% (93 runs sampled)

Node.js v6.9.x (Dec, 13, 2016)

Fastest

  deep-copy        x 205,727 ops/sec ±1.12% (91 runs sampled)

Slowest

  deepclone        x   9,045 ops/sec ±0.70% (92 runs sampled)

Results

  clone            x  19,151 ops/sec ±0.90% (93 runs sampled)
  clone-deep       x  24,586 ops/sec ±1.29% (92 runs sampled)
  clone-extend     x  13,206 ops/sec ±0.67% (91 runs sampled)
  cloneextend      x  29,955 ops/sec ±1.82% (92 runs sampled)
  component-clone  x  24,320 ops/sec ±0.75% (93 runs sampled)
  deep-copy        x 205,727 ops/sec ±1.12% (91 runs sampled)
  deepclone        x   9,045 ops/sec ±0.70% (92 runs sampled)
  deepcopy         x  13,843 ops/sec ±0.64% (93 runs sampled)
  extend           x  16,688 ops/sec ±1.24% (93 runs sampled)
  fast-clone       x  25,836 ops/sec ±2.20% (91 runs sampled)
  lodash.cloneDeep x  15,213 ops/sec ±1.49% (91 runs sampled)
  stringify-clone  x  53,364 ops/sec ±1.34% (94 runs sampled)
  structured-clone x  37,033 ops/sec ±0.91% (94 runs sampled)
  utils-copy       x  10,228 ops/sec ±0.96% (89 runs sampled)

Node.js v4.6.x (Dec, 13, 2016)

Fastest

  deep-copy        x 38,524 ops/sec ±1.63% (86 runs sampled)
  stringify-clone  x 46,885 ops/sec ±1.14% (89 runs sampled) (see note below) 

Slowest

  utils-copy       x  6,486 ops/sec ±0.78% (90 runs sampled)

Results

  clone            x 16,739 ops/sec ±1.21% (89 runs sampled)
  clone-deep       x 14,594 ops/sec ±0.98% (91 runs sampled)
  clone-extend     x 12,290 ops/sec ±0.97% (91 runs sampled)
  cloneextend      x 26,058 ops/sec ±1.40% (80 runs sampled)
  component-clone  x 26,727 ops/sec ±0.81% (96 runs sampled)
  deep-copy        x 38,524 ops/sec ±1.63% (86 runs sampled)
  deepclone        x  7,474 ops/sec ±0.81% (94 runs sampled)
  deepcopy         x 14,172 ops/sec ±0.86% (96 runs sampled)
  extend           x 19,430 ops/sec ±0.80% (93 runs sampled)
  fast-clone       x 18,556 ops/sec ±0.92% (91 runs sampled)
  lodash.cloneDeep x 12,093 ops/sec ±1.47% (82 runs sampled)
  stringify-clone  x 46,885 ops/sec ±1.14% (89 runs sampled)
  structured-clone x 35,511 ops/sec ±0.98% (95 runs sampled)
  utils-copy       x  6,486 ops/sec ±0.78% (90 runs sampled)

although stringify-clone was fastest here, it is just a wrapper around JSON.parse(JSON.stringify())! and thus does not provide true deep cloning for complex objects, review the project's README for details on limitations.