这是indexloc提供的服务，不要输入任何密码
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feat: cache string helpers #86

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feat: cache string helpers #86

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2 changes: 1 addition & 1 deletion packages/runtime-core/src/componentPublicInstance.ts
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
import { hasOwn, EMPTY_OBJ } from "@mini-vue/shared";
import { hasOwn } from "@mini-vue/shared";

const publicPropertiesMap = {
// 当用户调用 instance.proxy.$emit 时就会触发这个函数
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31 changes: 21 additions & 10 deletions packages/shared/src/index.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -7,14 +7,24 @@ export const isObject = (val) => {

export const isString = (val) => typeof val === "string";

// 缓存
const cacheStringFunction = (fn) => {
const cache = Object.create(null)
return ((str: string) => {
const hit = cache[str]
return hit || (cache[str] = fn(str))
})
}


const camelizeRE = /-(\w)/g;
/**
* @private
* 把烤肉串命名方式转换成驼峰命名方式
*/
export const camelize = (str: string): string => {
export const camelize = cacheStringFunction((str: string): string => {
return str.replace(camelizeRE, (_, c) => (c ? c.toUpperCase() : ""));
};
});

export const extend = Object.assign;

Expand All @@ -33,16 +43,16 @@ export function hasOwn(val, key) {
* @private
* 首字母大写
*/
export const capitalize = (str: string) =>
str.charAt(0).toUpperCase() + str.slice(1);

export const capitalize = cacheStringFunction((str: string) =>
str.charAt(0).toUpperCase() + str.slice(1)
)
/**
* @private
* 添加 on 前缀，并且首字母大写
*/
export const toHandlerKey = (str: string) =>
str ? `on${capitalize(str)}` : ``;

export const toHandlerKey = cacheStringFunction((str: string) =>
str ? `on${capitalize(str)}` : ``
)
// 用来匹配 kebab-case 的情况
// 比如 onTest-event 可以匹配到 T
// 然后取到 T 在前面加一个 - 就可以
Expand All @@ -51,5 +61,6 @@ const hyphenateRE = /\B([A-Z])/g;
/**
* @private
*/
export const hyphenate = (str: string) =>
str.replace(hyphenateRE, "-$1").toLowerCase();
export const hyphenate = cacheStringFunction((str: string) =>
str.replace(hyphenateRE, "-$1").toLowerCase()
)