forked from ramda/ramda
/
both.js
45 lines (43 loc) · 1.45 KB
/
both.js
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
import _curry2 from './internal/_curry2.js';
import _isFunction from './internal/_isFunction.js';
import and from './and.js';
import lift from './lift.js';
/**
* A function which calls the two provided functions and returns the `&&`
* of the results.
* It returns the result of the first function if it is false-y and the result
* of the second function otherwise. Note that this is short-circuited,
* meaning that the second function will not be invoked if the first returns a
* false-y value.
*
* In addition to functions, `R.both` also accepts any fantasy-land compatible
* applicative functor.
*
* @func
* @memberOf R
* @since v0.12.0
* @category Logic
* @sig (*... -> Boolean) -> (*... -> Boolean) -> (*... -> Boolean)
* @param {Function} f A predicate
* @param {Function} g Another predicate
* @return {Function} a function that applies its arguments to `f` and `g` and `&&`s their outputs together.
* @see R.either, R.and
* @example
*
* const gt10 = R.gt(R.__, 10)
* const lt20 = R.lt(R.__, 20)
* const f = R.both(gt10, lt20);
* f(15); //=> true
* f(30); //=> false
*
* R.both(Maybe.Just(false), Maybe.Just(55)); // => Maybe.Just(false)
* R.both([false, false, 'a'], [11]); //=> [false, false, 11]
*/
var both = _curry2(function both(f, g) {
return _isFunction(f) ?
function _both() {
return f.apply(this, arguments) && g.apply(this, arguments);
} :
lift(and)(f, g);
});
export default both;