example: get the properties of an object in an array of objects according to id const stage = [ { id: 0, name: a }, { id: 1, name: b }, { id: 2, name: c }, { id: 3, name: d }, { id: 4, name: e ...
topic description lambda groupingBy Advanced questions List < A > how to convert to List < B > sources of topics and their own ideas looked up a lot of materials and found that most of the Internet teaches how to convert List into Map < String,Li...
how to understand the code well in the case of cascading high-order functions with multiple arrow functions in es6 const setTitle = (title) => (WrappedComponent) => { return class extends React.Component { componentDidMount() { ...
curry = fn => { let arr = []; judge = (...args)=>{ if(!args[args.length-1]){ return fn(arr); }else{ arr.push(...args); re...
recently read functional programming Guide I can t understand the part of the container. There is a code that says Functor as follows: class Maybe { static of(x) { console.log(1); return new Maybe(x); } get isNothing() { console...
how to watch dom <template lang="html"> <div class="a"> <div class="goods-container"> <div class="goods-left" ref="leftScroll"> <ul> <li class=...
js Code function heredoc(fn) { return fn.toString().replace( ^[^ ]+ *!? s? , ). replace( * [^ ]+$ , ).trim().replace( > s*< g, >< ) } var data = [{ id: 1 , title: &...
the following code: document.querySelector(".div-bgd").style.display = "block"; document.querySelector(".load_div").style.display = "block"; console.log(1) alert(1) In the browser environment, why execute conso...
error url: https: graph.qq.com oauth2.0. my callback address is https: www.xfindzp.com socia. . ...
use multipart form-data for the first time No Content the second time before, I also thought it was caused by the component. The back end said that Access-Control-Allow-Headers is not the default request, so the request is not a simple request, like ...