Public
Edited
Feb 12, 2023
class Identity extends Inspectable {
constructor(x) {
super();
this.$value = x;
}
static of(x) {
return new Identity(x);
}
map(fn) {
return Identity.of(fn(this.$value));
}
}
// map :: Functor f => (a -> b) -> f a -> f b
map = R.curry((fn, functor) => functor.map(fn))
// append :: String -> String
append = R.curry((a,b) => b + a)
Identity.of("flamethrowers")
.map(append(" away"))
.map(R.prop("length"))
.inspect()
R.compose(map(append(" away")), Identity.of)("flamethrowers").inspect()
class Maybe extends Inspectable {
$value;
constructor(x) {
super();
this.$value = x;
}
static of(x) {
return new Maybe(x);
}
isNothing() {
return this.$value === null || this.$value === undefined;
}
map(fn) {
return this.isNothing() ? this : Maybe.of(fn(this.$value));
}
valueToString() {
return this.isNothing() ? 'Nothing' : `Just ${this.$value}`
}
}
Maybe.of("0123")
.map(R.prop(3))
.map((x) => "abc"[x])
.map((x) => x + x)
.inspect()
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