spread-obj-overrides-prev-properties.js (1618B)
1 // This file was procedurally generated from the following sources: 2 // - src/spread/obj-overrides-prev-properties.case 3 // - src/spread/default/array.template 4 /*--- 5 description: Object Spread properties overrides previous definitions (Array initializer) 6 esid: sec-runtime-semantics-arrayaccumulation 7 features: [object-spread] 8 flags: [generated] 9 info: | 10 SpreadElement : ...AssignmentExpression 11 12 1. Let spreadRef be the result of evaluating AssignmentExpression. 13 2. Let spreadObj be ? GetValue(spreadRef). 14 3. Let iterator be ? GetIterator(spreadObj). 15 4. Repeat 16 a. Let next be ? IteratorStep(iterator). 17 b. If next is false, return nextIndex. 18 c. Let nextValue be ? IteratorValue(next). 19 d. Let status be CreateDataProperty(array, ToString(ToUint32(nextIndex)), 20 nextValue). 21 e. Assert: status is true. 22 f. Let nextIndex be nextIndex + 1. 23 24 Pending Runtime Semantics: PropertyDefinitionEvaluation 25 26 PropertyDefinition:...AssignmentExpression 27 28 1. Let exprValue be the result of evaluating AssignmentExpression. 29 2. Let fromValue be GetValue(exprValue). 30 3. ReturnIfAbrupt(fromValue). 31 4. Let excludedNames be a new empty List. 32 5. Return CopyDataProperties(object, fromValue, excludedNames). 33 34 ---*/ 35 let o = {a: 2, b: 3}; 36 37 38 var callCount = 0; 39 40 (function(obj) { 41 assert.sameValue(obj.a, 2); 42 assert.sameValue(obj.b, 3); 43 assert.sameValue(Object.keys(obj).length, 2); 44 assert.sameValue(o.a, 2); 45 assert.sameValue(o.b, 3); 46 callCount += 1; 47 }.apply(null, [{a: 1, b: 7, ...o}])); 48 49 assert.sameValue(callCount, 1); 50 51 reportCompare(0, 0);