Benchmark: Mutation vs non-mutation in reduce

Tests:

No mutation
"use strict"; function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; } var array = new Array(999).fill(null).map(function (_, i) { return i; }); array.reduce(function (acc, item) { return Object.assign({}, acc, _defineProperty({}, item, true)); }, {}); /* const array = new Array(999).fill(null).map((_,i) => i) array.reduce((acc, item) => Object.assign({}, acc, { [item]: true }), {}) */
With mutation
"use strict"; function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; } var array = new Array(999).fill(null).map(function (_, i) { return i; }); array.reduce(function (acc, item) { return Object.assign(acc, _defineProperty({}, item, true)); }, {}); /* const array = new Array(999).fill(null).map((_,i) => i) array.reduce((acc, item) => Object.assign(acc, { [item]: true }), {}) */

Rendered benchmark preparation results:

Previous results

Test case name	Result
No mutation
With mutation

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Related benchmarks:

Mutation vs non-mutation in reduce (version: 2)