34 lines
670 B
JavaScript
34 lines
670 B
JavaScript
|
/**
|
||
|
* @category constructors
|
||
|
* @since 2.2.7
|
||
|
*/
|
||
|
export var of = function (a) { return ({ _tag: 'Of', value: a }); };
|
||
|
/**
|
||
|
* @category constructors
|
||
|
* @since 2.2.7
|
||
|
*/
|
||
|
export var concat = function (left, right) { return ({
|
||
|
_tag: 'Concat',
|
||
|
left: left,
|
||
|
right: right
|
||
|
}); };
|
||
|
/**
|
||
|
* @category destructors
|
||
|
* @since 2.2.7
|
||
|
*/
|
||
|
export var fold = function (onOf, onConcat) { return function (f) {
|
||
|
switch (f._tag) {
|
||
|
case 'Of':
|
||
|
return onOf(f.value);
|
||
|
case 'Concat':
|
||
|
return onConcat(f.left, f.right);
|
||
|
}
|
||
|
}; };
|
||
|
/**
|
||
|
* @category instances
|
||
|
* @since 2.2.7
|
||
|
*/
|
||
|
export function getSemigroup() {
|
||
|
return { concat: concat };
|
||
|
}
|