Object literal
An object literal is a language expression that directly specifies an object value and its constituent properties or values.
Essential TypeScript 5, Third Edition
Object literal syntax is JavaScript syntax for directly defining an object by listing its properties and values.
- How it is used
- Uses object literals to define everyday JavaScript data and return typed records from application methods.
- How deep it goes
- Explains brace syntax, property access, shape inference, aliases, and heterogeneous-array errors without descending into object internals.
- Examples
- Demonstrates hat and boots products, a mixed product array, and a typed todo-item count record.
- What you can do after
- Build object literals, use their properties, name their shapes, and diagnose unsafe property access in mixed arrays.
Read how Essential TypeScript 5, Third Edition explains object literal →
The Joy of JavaScript
A JavaScript syntax form for creating an object directly from a literal expression.
- How it is used
- Groups related data for one-time use or supplies a simple object that can be passed to or returned from a function.
- How deep it goes
- Defines direct creation and contrasts alternatives, then shows a literal serving as a prototype without developing property descriptors.
- Examples
- Uses a transaction literal containing sender and recipient data, then links a money transaction to it with Object.create.
- What you can do after
- Apply it to create compact one-off data objects and prototype objects, while selecting factories or classes for repeated shapes.
Related concepts
- spread operatorused by · A spread operator is syntax that unpacks a collection’s elements or an object’s properties into individual values within an expression or function call.
- JavaScriptused by · JavaScript is a high-level, dynamically typed, multi-paradigm programming language standardized as ECMAScript and used for web and general-purpose programming.
- getteruses · A property accessor that executes code and returns a value when the property is read.
- objectproduces · A computational object is a runtime entity or structured value representing data, state, or a resource, with properties or operations defined by its programming model.
- literalkind of · A literal is a language construct that directly denotes a fixed value or specifies an exact value permitted by a type.
These guides are generated from the text of Manning books by Manning's knowledge graph and link to the sections they draw on. The full books are available on liveBook and at manning.com.