Improvements in Property Access for Object Initializers

The proposal by Ron Buckton of Microsoft Corporation introduces shorthand improvements in property access within object initializers and destructuring assignments. It explores enhancements to object initializers, destructuring assignments, and the semantics behind them. The proposal aims to simplify coding practices and enhance readability by providing more concise ways to access object properties.

• JavaScript
• Shorthand Property
• Object Initializers
• Destructuring Assignments

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Uploaded on Feb 15, 2025 | 0 Views

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Presentation Transcript

1. SHORTHAND PROPERTY IMPROVEMENTS Ron Buckton Microsoft Corporation

2. Property Access in object initializers // object initializer, dot-notation const a = { o.x }; Property Access in destructuring assignments // object initializer, bracket-notation const a = { o["x"] }; // destructuring, dot-notation ({ a.x } = o); // destructuring, bracket-notation ({ a["x"] } = o); PROPOSAL

3. Object initializers {o.x} is identical to {x: o.x} {o["x"]} is (roughly) identical to {["x"]: o["x"]} Destructuring Assignment ({a.x} = o) is identical to ({x: a.x} = o} ({a["x"] } = o) is (roughly) identical to ({["x"]: a["x"]} = o) Actual implementations would use GetReferencedName SEMANTICS

4. PropertyDefinition[Yield, Await] : MemberExpression[?Yield, ?Await] .IdentifierName MemberExpression[?Yield, ?Await] [Expression] CallExpression[?Yield, ?Await] .IdentifierName CallExpression[?Yield, ?Await] [Expression] AssignmentProperty[Yield, Await] : MemberExpression[?Yield, ?Await] .IdentifierNameInitializer[+In, ?Yield, ?Await]opt MemberExpression[?Yield, ?Await] [Expression]Initializer[+In, ?Yield, ?Await]opt CallExpression[?Yield, ?Await] .IdentifierNameInitializer[+In, ?Yield, ?Await]opt CallExpression[?Yield, ?Await] [Expression]Initializer[+In, ?Yield, ?Await]opt GRAMMAR

5. Stage: 0 Identified Champions: Ron Buckton Strawman available https://github.com/rbuckton/proposal-shorthand-improvements STATUS