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perf: cache string helpers

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This commit is contained in:
Evan You 2019-12-16 13:06:43 -05:00
parent 51980afca2
commit 04e11187b9
1 changed files with 23 additions and 9 deletions
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28
packages/shared/src/index.ts
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@ -66,19 +66,33 @@ export const isReservedProp = /*#__PURE__*/ makeMap(
'onVnodeBeforeUnmount,onVnodeUnmounted'
)
const camelizeRE = /-(\w)/g
export const camelize = (str: string): string => {
return str.replace(camelizeRE, (_, c) => (c ? c.toUpperCase() : ''))
function cacheStringFunction<T extends (str: string) => string>(fn: T): T {
const cache: Record<string, string> = Object.create(null)
return ((str: string) => {
const hit = cache[str]
return hit || (cache[str] = fn(str))
}) as any
}
const camelizeRE = /-(\w)/g
export const camelize = cacheStringFunction(
(str: string): string => {
return str.replace(camelizeRE, (_, c) => (c ? c.toUpperCase() : ''))
}
)
const hyphenateRE = /\B([A-Z])/g
export const hyphenate = (str: string): string => {
export const hyphenate = cacheStringFunction(
(str: string): string => {
return str.replace(hyphenateRE, '-$1').toLowerCase()
}
}
)
export const capitalize = (str: string): string => {
export const capitalize = cacheStringFunction(
(str: string): string => {
return str.charAt(0).toUpperCase() + str.slice(1)
}
}
)
// compare whether a value has changed, accounting for NaN.
export const hasChanged = (value: any, oldValue: any): boolean =>