function flattenObject(obj: any): any { return Object.keys(obj).reduce((acc, key) => { if (typeof obj[key] === 'object' && !Array.isArray(obj[key])) { const flattenedObject = flattenObject(obj[key]); Object.keys(flattenedObject).forEach((nestedKey) => { acc[`${key}.${nest...
in关键字用来检查一个属性是否属于一个对象,如果这个条件为true,TypeScript就会默认这个变量的类型是我们指定的类型。例如: type Student = { name: string; major: string; gpa: number; } function printStudentInfo(student: Student, key: string) { if (key in student) { console.log(student[key]); }...
[k:string]:T}// Array.prototype.map, but for DictfunctionmapDict<T,S>(input:Dict<T>,transform:(item:T,key:string)=>S):Dict<S>{constobj:Dict<S>={};for(letxininput){obj[x]=transform(input[x],x);}returnobj;}// Array.prototype.filter, but for DictfunctionfilterDict<T>(input:...
PHP array_reduce() 函数嵌套对象转map,当对象嵌套层次太深，获取子对象的值及其不便，为解决这一问题...
1. Sum all the values of an arrayvar sum = [0,1,2,3].reduce(function(a, c) { return a + c;}, 0);// sum is 6 ES6:let total = [0,1,2,3].reduce( (accumulator, currentValue) => accumulator + ... edn php github
Updated Nov 6, 2023 TypeScript mfix22 / morphmorph Sponsor Star 28 Code Issues Pull requests 😱 Isomorphic transformations. Map, transform, filter, and morph your objects functional isomorphic mapping filter transformations reduce morph function-composition isomorphic-transformations Updated Jan 3,...
Stream of Function[] 您似乎希望reduce使用andThen函数。假设conversions不能为空,可以执行以下操作: static <T> T applyConversions(T value, Function<T, T>... conversions) { return Arrays.stream(conversions).reduce(Function::andThen).get().apply(value);} 如果它可以为空,则需要决定当它为空时返回...
acc, []);} 测试 filter([null, false, 1, 0, '', () => {}, NaN], val => !!val);// [1, () => {}]some some当⽬标数组为空返回false，故初始值为false。function some(arr, predicate) { return arr.reduce((acc, val, idx) => acc || predicate(val, idx, arr), false)
functionisBigEnough(element, index, array) {return(element >=10); }varpassed = [2,5,8,1,4].some(isBigEnough);// passed is falsepassed = [12,5,8,1,4].some(isBigEnough);// passed is true filter() var newArr = arr.filter(callback[, thisArg]) ...
function updateItemInArray(array, itemId, updateItemCallback) {} function createReducer(initialState, handlers) { return function reducer(state = initialState, action) { if (handlers.hasOwnProperty(action.type)) { return handlers[action.type](state, action) ...