tessl/npm-emotion--memoize
A memoization utility that caches function results based on string arguments
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Quality
Pending
Does it follow best practices?
Impact
Pending
No eval scenarios have been run
@emotion/memoize
@emotion/memoize is a simple and efficient memoization utility function that caches the results of expensive function calls based on string arguments. It provides a lightweight caching mechanism to avoid redundant calculations for functions that accept string parameters.
Package Information
- Package Name: @emotion/memoize
- Package Type: npm
- Language: TypeScript
- Installation:
npm install @emotion/memoize
Core Imports
import memoize from "@emotion/memoize";For CommonJS:
const memoize = require("@emotion/memoize");Basic Usage
import memoize from "@emotion/memoize";
// Define a function that performs expensive computation
function expensiveComputation(input: string): string {
console.log(`Computing for: ${input}`);
return input.toUpperCase().repeat(3);
}
// Create a memoized version
const memoizedCompute = memoize(expensiveComputation);
// First call - computation is performed
const result1 = memoizedCompute("hello"); // Logs: "Computing for: hello"
console.log(result1); // "HELLOHELLOHELLO"
// Second call with same input - result is cached
const result2 = memoizedCompute("hello"); // No log - cached result used
console.log(result2); // "HELLOHELLOHELLO"
// Different input - computation is performed
const result3 = memoizedCompute("world"); // Logs: "Computing for: world"
console.log(result3); // "WORLDWORLDWORLD"
// Note: Each memoized function maintains its own cache throughout its lifetime
// The cache uses Object.create(null) to prevent prototype pollutionCapabilities
Memoization Function
Creates a memoized version of a function that caches results based on string arguments.
/**
* Creates a memoized version of a function that caches results based on string arguments
* @param fn - Function to memoize that takes a string argument and returns a value
* @returns Memoized function with the same signature as the input function
*/
function memoize<V>(fn: (arg: string) => V): (arg: string) => V;Parameters:
fn: A function that accepts a single string argument and returns a value of typeV
Returns:
- A memoized version of the input function that maintains an internal cache
Type Safety:
- The memoized function preserves the exact input and output types of the original function
- Generic type parameter
Vrepresents the return type of the memoized function
Caching Behavior:
- Uses
Object.create(null)for the internal cache to avoid prototype pollution - Cache keys are the string arguments passed to the function
- Results are cached indefinitely (no expiration or size limits)
- Each memoized function maintains its own separate cache instance
- Cache persists for the lifetime of the memoized function
- Memory usage grows with unique string arguments; consider the function's usage pattern
Usage Examples:
// String transformation
const memoizedUpperCase = memoize((str: string) => str.toUpperCase());
console.log(memoizedUpperCase("hello")); // "HELLO"
// Complex computation returning objects
const memoizedParser = memoize((json: string) => JSON.parse(json));
const obj = memoizedParser('{"name": "John", "age": 30}');
// Function returning arrays
const memoizedSplit = memoize((str: string) => str.split(","));
const parts = memoizedSplit("a,b,c"); // ["a", "b", "c"]
// CSS processing example (common use case in emotion ecosystem)
const memoizedCSSProcessor = memoize((css: string) => {
// Expensive CSS processing logic
return css.replace(/\s+/g, " ").trim();
});Type Information
The memoize function uses TypeScript generics to ensure type safety. The generic type parameter V represents the return type of the function being memoized, preserving the exact type through the memoization process. No additional types are exported by this package.
Install with Tessl CLI
npx tessl i tessl/npm-emotion--memoize- Workspace
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