प्रॉमिस के फंदे

// This doesn't make sense w/ promises:
console.log(Promise.resolve(42));

// We must use the `.then` interface:
Promise.resolve(42).then(value => console.log(value));

// Option #1:
Promise.resolve(42).then(console.log());

// Option #2:
Promise.resolve(42).then(console.log);

// Option #3:
Promise.resolve(42).then(value => console.log(value));

// Option #4:
Promise.resolve(42)
  .then(console.log())
  .then(console.log);

var arg1 = console.log();
var arg2 = console.log;
var arg3 = value => console.log(value);

typeof arg1 === "undefined";
typeof arg2 === "function";
typeof arg3 === "function";

// Option #4 - effectively
Promise.resolve(42)
  .then(undefined) // यह मान पर कोई प्रभाव नहीं डालता, यह अगले `.then(fn)` को पास किया जाएगा
  .then(console.log);