Created
September 1, 2023 21:12
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Comparison of performance of different types of `for` loops
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| import { bench, group, run } from "mitata"; | |
| const ENTRIES = 100000; | |
| const OBJ_TEST = new Array(ENTRIES).fill(0).map((_) => ({ | |
| id: "Appointment.priority", | |
| path: "Appointment.priority", | |
| short: "Used to make informed decisions if needing to re-prioritize", | |
| definition: | |
| "The priority of the appointment. Can be used to make informed decisions if needing to re-prioritize appointments. (The iCal Standard specifies 0 as undefined, 1 as highest, 9 as lowest priority).", | |
| comment: | |
| "Seeking implementer feedback on this property and how interoperable it is.\r\rUsing an extension to record a CodeableConcept for named values may be tested at a future connectathon.", | |
| min: 0, | |
| max: "1", | |
| base: { path: "Appointment.priority", min: 0, max: "1" }, | |
| type: [{ code: "unsignedInt" }], | |
| constraint: [ | |
| { | |
| key: "ele-1", | |
| severity: "error", | |
| human: "All FHIR elements must have a @value or children", | |
| expression: "hasValue() or (children().count() > id.count())", | |
| xpath: "@value|f:*|h:div", | |
| source: "http://hl7.org/fhir/StructureDefinition/Element", | |
| }, | |
| ], | |
| isModifier: false, | |
| isSummary: false, | |
| mapping: [ | |
| { identity: "workflow", map: "Request.priority" }, | |
| { identity: "w5", map: "FiveWs.class" }, | |
| { identity: "v2", map: "ARQ-12, SCH-11.6 / TQ1-9" }, | |
| { identity: "rim", map: ".priorityCode" }, | |
| { identity: "ical", map: "PRIORITY" }, | |
| ], | |
| })); | |
| const NUM_TEST = new Array(ENTRIES).fill(0).map((_, i) => i); | |
| const STR_TEST = new Array(ENTRIES).fill(0).map((_, i) => i.toString().repeat(20)); | |
| group("For loops - objects", () => { | |
| bench("For...of", () => { | |
| let test; | |
| for (const obj of OBJ_TEST) { | |
| test = obj.constraint[0].expression; | |
| } | |
| }); | |
| bench("Numeric for loop", () => { | |
| let test; | |
| for (let i = 0; i < OBJ_TEST.length; i++) { | |
| test = OBJ_TEST[i].constraint[0].expression; | |
| } | |
| }); | |
| bench(".forEach()", () => { | |
| let test; | |
| OBJ_TEST.forEach(obj => { | |
| test = obj.constraint[0].expression; | |
| }); | |
| }) | |
| }); | |
| group("For loops - nums", () => { | |
| bench("Numeric for loop", () => { | |
| let test; | |
| for (let i = 0; i < NUM_TEST.length; i++) { | |
| test = NUM_TEST[i]; | |
| } | |
| }); | |
| bench(".forEach()", () => { | |
| let test; | |
| NUM_TEST.forEach(num => { | |
| test = num; | |
| }); | |
| }); | |
| bench("For...of", () => { | |
| let test; | |
| for (const num of NUM_TEST) { | |
| test = num; | |
| } | |
| }); | |
| }); | |
| group("For loops - strings", () => { | |
| bench("Numeric for loop", () => { | |
| let test; | |
| for (let i = 0; i < STR_TEST.length; i++) { | |
| test = STR_TEST[i]; | |
| } | |
| }); | |
| bench(".forEach()", () => { | |
| let test; | |
| STR_TEST.forEach(str => { | |
| test = str; | |
| }); | |
| }); | |
| bench("For...of", () => { | |
| let test; | |
| for (const str of STR_TEST) { | |
| test = str; | |
| } | |
| }); | |
| }); | |
| await run(); |
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