6 replies

Understanding `zipRight` and `zipLeft` Equivalence

Hey, I seem to be misunderstanding

zipRight

zipRight

and

zipLeft

zipLeft

. Why are these two equivalent?

const a = E.Effect.sync(() => {
    console.log('a');
});
const b = E.Effect.sync(() => {
    console.log('b');
});

// b
// a
console.log(E.Effect.runSync(E.Effect.zipLeft(a)(b)));
// b
// a
console.log(E.Effect.runSync(E.Effect.zipRight(a)(b)));

const a = E.Effect.sync(() => {
    console.log('a');
});
const b = E.Effect.sync(() => {
    console.log('b');
});

// b
// a
console.log(E.Effect.runSync(E.Effect.zipLeft(a)(b)));
// b
// a
console.log(E.Effect.runSync(E.Effect.zipRight(a)(b)));

I would assume the order to be flipped.

Effect Community•3y ago•

6 replies

Understanding `zipRight` and `zipLeft` Equivalence

Hey, I seem to be misunderstanding

zipRight

zipRight

and

zipLeft

zipLeft

. Why are these two equivalent?

const a = E.Effect.sync(() => {
    console.log('a');
});
const b = E.Effect.sync(() => {
    console.log('b');
});

// b
// a
console.log(E.Effect.runSync(E.Effect.zipLeft(a)(b)));
// b
// a
console.log(E.Effect.runSync(E.Effect.zipRight(a)(b)));

const a = E.Effect.sync(() => {
    console.log('a');
});
const b = E.Effect.sync(() => {
    console.log('b');
});

// b
// a
console.log(E.Effect.runSync(E.Effect.zipLeft(a)(b)));
// b
// a
console.log(E.Effect.runSync(E.Effect.zipRight(a)(b)));

I would assume the order to be flipped.

Understanding `zipRight` and `zipLeft` Equivalence

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