Run results for: Switch vs Functional Approach

Test name	Executions per second
✓ Vanilla Switch	176,351,536 Ops/sec
Switch Fn style	3,866,540 Ops/sec

Tests:

Vanilla Switch
function isFunc (v) { return typeof v === 'function'; } function isDefined (v) { return v !== undefined && v !== null; } function switchEnum(e, handlers) { const specific = handlers[e]; if (isDefined(specific)) { return isFunc(specific) ? specific(e) : specific; } if (isDefined(handlers.else)) { return isFunc(handlers.else) ? handlers.else(e) : handlers.else; } throw new Error(`Unhandled switchEnum statement for value (${e}).`); } function normal(inp) { switch (inp) { case "today": return 1; case "tomorrow": return 2; case "yesterday": return -1; default: return 0; } }; normal('today'); normal('yesterday'); normal('tomorrow');
Switch Fn style
function isFunc (v) { return typeof v === 'function'; } function isDefined (v) { return v !== undefined && v !== null; } function switchEnum(e, handlers) { const specific = handlers[e]; if (isDefined(specific)) { return isFunc(specific) ? specific(e) : specific; } if (isDefined(handlers.else)) { return isFunc(handlers.else) ? handlers.else(e) : handlers.else; } throw new Error(`Unhandled switchEnum statement for value (${e}).`); } function funcccy(inp) { return switchEnum(inp, { "today": () => 1, "tomorrow": () => 2, "yesterday": () => -1, "else": () => 0, }); } funcccy('today'); funcccy('yesterday'); funcccy('tomorrow');