函数式编程compose 与Box
函数式编程compose 与Box
const compose = (...fns) =>fns.reduce((a, b) =>(...x)=> b(a(x)));
const trim1 = str => {
console.log(str)
let s = str.trim()
return s;
}
const toNumber = str =>{
console.log('3333')
return parseInt(str)
}
const nextNumber = number =>{
console.log('2222')
return number + 1;
}
const createStr = number =>{
console.log('1111')
return String.fromCharCode(number);
}
const nextChartFromNumberString = compose(toNumber,nextNumber,createStr);
const result = nextChartFromNumberString(' 64');
console.log(result)
const Box = x => ({
super: f => Box(f(x)),
inspect: () => `${x}`
})
const nextChartFromNumberString = str => Box(str)
.super(s => s.trim()).super(r => parseInt(r)).super(i => i + 1).super(i => String.fromCharCode(i))
const result = nextChartFromNumberString(' 64').inspect()
console.log(result)
两种方式所用的到方法不一样，可以体会一下函数式编程