clampClamp a number between a minimum and maximum value.
function clamp(value: number, min: number, max: number): number| Parameter | Type | Description |
|---|---|---|
value | number | Input value |
min | number | Lower bound |
max | number | Upper bound |
Returns the clamped value.
clamp(150, 0, 100) // 100
clamp(-5, 0, 100) // 0
clamp(50, 0, 100) // 50debounceCreate a debounced version of a function that delays invocation until after ms milliseconds have elapsed since the last call.
function debounce<T extends (...args: unknown[]) => void>(
fn: T,
ms: number
): (...args: Parameters<T>) => void| Parameter | Type | Description |
|---|---|---|
fn | T | Function to debounce |
ms | number | Delay in milliseconds |
Returns a debounced wrapper function.
const save = debounce(() => writeFile(), 500)
// Only fires 500ms after the last call
save()
save()
save() // only this one executesgroupByGroup an array of items by a key derived from each item.
function groupBy<T>(items: readonly T[], keyFn: (item: T) => string): Record<string, readonly T[]>| Parameter | Type | Description |
|---|---|---|
items | readonly T[] | Array to group |
keyFn | (item: T) => string | Key extractor function |
Returns an object mapping keys to arrays of items.
const users = [
{ name: 'Alice', role: 'admin' },
{ name: 'Bob', role: 'user' },
{ name: 'Carol', role: 'admin' },
]
groupBy(users, (u) => u.role)
// {
// admin: [{ name: 'Alice', role: 'admin' }, { name: 'Carol', role: 'admin' }],
// user: [{ name: 'Bob', role: 'user' }],
// }