Benchmark: JavaScript filter vs reduce more cases ha

JavaScript filter vs reduce more cases ha (version: 1)

Comparing performance of: Using array filter and reduce + spread vs Using array filter and object assign vs Using array filter and object assign SMALLER array first vs Using array filter and object assign SMALLER array first, includes instead of in vs Using array filter and reduce + spread + includes

Created: 4 years ago by: Registered User

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Tests:

Using array filter and reduce + spread
PRIMARY_SCOPES = ['a', 'd'] availableScopes = {'a': 'A', 'b': 'B', 'c': 'C', 'd': 'D'} const output = PRIMARY_SCOPES.filter((scope) => scope in availableScopes).reduce( (result, scope) => ({ ...result, [scope]: availableScopes[scope], }), {}, );
Using array filter and object assign
PRIMARY_SCOPES = ['a', 'd'] availableScopes = {'a': 'A', 'b': 'B', 'c': 'C', 'd': 'D'} const output = {}; Object.entries(availableScopes).forEach(([key, value]) => { if (!PRIMARY_SCOPES.includes(key)) { return; } Object.assign(output, { [key]: value }); }); return output;
Using array filter and object assign SMALLER array first
PRIMARY_SCOPES = ['a', 'd'] availableScopes = {'a': 'A', 'b': 'B', 'c': 'C', 'd': 'D'} const output = {}; PRIMARY_SCOPES.filter((scope) => scope in availableScopes).forEach((scope) => { Object.assign(output, { [scope]: availableScopes[scope] }); }); return output;
Using array filter and object assign SMALLER array first, includes instead of in
PRIMARY_SCOPES = ['a', 'd'] availableScopes = {'a': 'A', 'b': 'B', 'c': 'C', 'd': 'D'} const output = {}; PRIMARY_SCOPES.filter((scope) => Object.keys(availableScopes).includes(scope)).forEach((scope) => { Object.assign(output, { [scope]: availableScopes[scope] }); }); return output;
Using array filter and reduce + spread + includes
PRIMARY_SCOPES = ['a', 'd'] availableScopes = {'a': 'A', 'b': 'B', 'c': 'C', 'd': 'D'} const output = PRIMARY_SCOPES.filter((scope) => Object.keys(availableScopes).includes(scope)).reduce( (result, scope) => ({ ...result, [scope]: availableScopes[scope], }), {}, );

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Using array filter and reduce + spread
Using array filter and object assign
Using array filter and object assign SMALLER array first
Using array filter and object assign SMALLER array first, includes instead of in
Using array filter and reduce + spread + includes

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Slowest: N/A

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