Benchmark: Array of objects composite key creation, using Array.toString() or string as key (v3)

Array of objects composite key creation, using Array.toString() or string as key (v3) (version: 3)

Comparing performance of: With Array.toString() as composite key, using keys.reduce() vs With Array.toString() as composite key, using keys.map() vs With string as composite key, using keys.reduce() with template literals vs With string as composite key, using keys.reduce() with string concat

Created: 4 years ago by: Registered User

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Script Preparation code:

var entitiesCount = 10000;

var entities = Array.from({ length: entitiesCount }).map(() => ({
  key1: Math.round(Math.random() * entitiesCount),
  key2: Math.round(Math.random() * entitiesCount),
}));

Tests:

With Array.toString() as composite key, using keys.reduce()
entities.map((entity) => [ ['key1', 'key2'].reduce( (ck, key) => [...ck, entity[key]], [] ).toString(), entity ]);
With Array.toString() as composite key, using keys.map()
entities.map((entity) => [ ['key1', 'key2'].map( (key) => entity[key] ).toString(), entity ]);
With string as composite key, using keys.reduce() with template literals
entities.map((entity) => [ ['key1', 'key2'].reduce( (ck, key) => `${ck},${entity[key]}`, '' ), entity ]);
With string as composite key, using keys.reduce() with string concat
entities.map((entity) => [ ['key1', 'key2'].reduce( (ck, key) => ck + entity[key], '' ), entity ]);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
With Array.toString() as composite key, using keys.reduce()
With Array.toString() as composite key, using keys.map()
With string as composite key, using keys.reduce() with template literals
With string as composite key, using keys.reduce() with string concat

Fastest: N/A

Slowest: N/A

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