// This file was procedurally generated from the following sources: // - src/dstr-assignment/obj-prop-elem-init-evaluation.case // - src/dstr-assignment/default/for-of.template /*--- description: The Initializer should only be evaluated if v is undefined. (For..of statement) esid: sec-for-in-and-for-of-statements-runtime-semantics-labelledevaluation features: [destructuring-binding] flags: [generated] info: | IterationStatement : for ( LeftHandSideExpression of AssignmentExpression ) Statement 1. Let keyResult be the result of performing ? ForIn/OfHeadEvaluation(« », AssignmentExpression, iterate). 2. Return ? ForIn/OfBodyEvaluation(LeftHandSideExpression, Statement, keyResult, assignment, labelSet). 13.7.5.13 Runtime Semantics: ForIn/OfBodyEvaluation [...] 4. If destructuring is true and if lhsKind is assignment, then a. Assert: lhs is a LeftHandSideExpression. b. Let assignmentPattern be the parse of the source text corresponding to lhs using AssignmentPattern as the goal symbol. [...] ---*/ var flag1 = false; var flag2 = false; var x, y; var counter = 0; for ({ x: x = flag1 = true, y: y = flag2 = true } of [{ y: 1 }]) { assert.sameValue(x, true, 'value of `x`'); assert.sameValue(flag1, true, 'value of `flag1`'); assert.sameValue(y, 1, 'value of `y`'); assert.sameValue(flag2, false, 'value of `flag2`'); counter += 1; } assert.sameValue(counter, 1); reportCompare(0, 0);