Takes several functions as argument and returns a function that is the juxtaposition of those functions.
Array.prototype.map()
to return a fn
that can take a variable number of args
.fn
is called, return an array containing the result of applying each fn
to the args
.const juxt = (...fns) => (...args) => [...fns].map(fn => [...args].map(fn));
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']]
JavaScript, Function
Takes a variadic function and returns a function that accepts an array of arguments.
JavaScript, Function
Takes a function as an argument, then makes the first argument the last.
JavaScript, Function
Returns a function that takes one argument and runs a callback if it's truthy or returns it if falsy.