Takes several functions as argument and returns a function that is the juxtaposition of those functions.
Use Array.prototype.map()
to return a fn
that can take a variable number of args
.
When fn
is called, return an array containing the result of applying each fn
to the args
.
代码片段
const juxt = (...fns) => (...args) => [...fns].map(fn => [...args].map(fn));
使用样例
juxt(
x => x + 1,
x => x - 1,
x => x * 10
)(1, 2, 3); // [[2,3,4],[0,1,2],[10,20,30]]
juxt(
s => s.length,
s => s.split(" ").join("-")
)("30 seconds of code"); // [[18],['30-seconds-of-code']]