Function binding
Function binding is the creation of a function with a predetermined this value and, optionally, preset arguments.
Functional Programming in JavaScript
The technique of associating a function with a specific this value or preset arguments so it can be invoked in a controlled context.
- How it is used
- Uses preset arguments to turn general functions into modular, reusable operations.
- How deep it goes
- Defines binding, contrasts it with currying and partial application, and demonstrates configured callbacks without detailing binding internals.
- Examples
- Demonstrates a bound logger, partially configured string methods, and scheduled callbacks.
- What you can do after
- Apply it via Lodash _.bind or JavaScript Function.prototype.bind to create configured functions.
Read how Functional Programming in JavaScript explains function binding →
The Joy of JavaScript
The JavaScript method that creates a new function with a bound this value and optional leading arguments.
- How it is used
- Uses bind to repair a method's this reference while composing functions around object state.
- How deep it goes
- Explains context correction, partial argument application, and maintainability tradeoffs before shifting to explicit parameters.
- Examples
- Uses assemble.bind(this, keys) inside calculateHash and contrasts it with assemble(keys, obj).
- What you can do after
- Apply it via JavaScript's bind method to preserve object context and prefill keys, while recognizing its maintainability cost.
Related concepts
- thisconfigures · In JavaScript, the this value is determined by a function’s call context or, for an arrow function, inherited lexically.
- arrow functioncontrasts with · An arrow function is a JavaScript function expression written with arrow syntax that uses lexical binding for this and has no own arguments object.
- functionproduces · A function is a defined operation that maps inputs to outputs and, when implemented as a callable program unit, may also produce effects.
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