Promise executor II

Question

What does the code snippet to the right output by console.log?

Snippet

const p1 = Promise.resolve(1)
const p2 = new Promise((resolve) => resolve(p1))
const p3 = Promise.resolve(p1)
const p4 = p2.then(() => new Promise((resolve) => resolve(p3)))
const p5 = p4.then(() => p4)

console.log(p1 == p2)
console.log(p1 == p3)
console.log(p3 == p4)
console.log(p4 == p5)

Source

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