Hola, tengo una matriz con una clave de mensajes que tiene varios objetos, quiero eliminar todos los objetos excepto el último objeto de la matriz de mensajes.
Tengo una matriz de ejemplo a continuación:
const array = [ { messages: [ { content: "abc", id: "message01" }, { content: "def", id: "message02" }, { content: "ghi", id: "message03" } ], user: "user 1", participants: ["user1", "user2"], id: "chat01" }, { messages: [ { content: "hello", id: "message01" }, { content: "hi", id: "message02" }, { content: "How are you", id: "message03" } ], user: "user 2", participants: ["user1", "user2"], id: "chat02" } ];mi matriz exceptuada a continuación:
const expectedArray = [ { messages: [{ content: "ghi", id: "message03" }], user: "user 1", participants: ["user1", "user2"], id: "chat01" }, { messages: [{ content: "How are you", id: "message03" }], user: "user 2", participants: ["user1", "user2"], id: "chat02" } ];¿Es esto lo que quieres?
EDITAR : este código hará un bucle en la matriz y configurará los messages en messages[0] que es el último objeto
const array = [ { messages: [ { content: "abc", id: "message01" }, { content: "def", id: "message02" }, { content: "ghi", id: "message03" } ], user: "user 1", participants: ["user1", "user2"], id: "chat01" }, { messages: [ { content: "hello", id: "message01" }, { content: "hi", id: "message02" }, { content: "How are you", id: "message03" } ], user: "user 2", participants: ["user1", "user2"], id: "chat02" } ]; array.forEach(e=>{ e.messages = e.messages[e.messages.length - 1] }) console.log(array) const array = [ { messages: [ { content: "abc", id: "message01" }, { content: "def", id: "message02" }, { content: "ghi", id: "message03" } ], user: "user 1", participants: ["user1", "user2"], id: "chat01" }, { messages: [ { content: "hello", id: "message01" }, { content: "hi", id: "message02" }, { content: "How are you", id: "message03" } ], user: "user 2", participants: ["user1", "user2"], id: "chat02" } ]; /** slice() method gets the last element of the array. If we provide negative index -1 to it then it will remove the last item and return it as a new array. We overwrite messages array with the return value of the slice() method which is a new array containing only the last element of the original messages array. */ array.forEach(e => e.messages = e.messages.slice(-1)) console.log(array) const array = [ { messages: [ { content: "abc", id: "message01" }, { content: "def", id: "message02" }, { content: "ghi", id: "message03" } ], user: "user 1", participants: ["user1", "user2"], id: "chat01" }, { messages: [ { content: "hello", id: "message01" }, { content: "hi", id: "message02" }, { content: "How are you", id: "message03" } ], user: "user 2", participants: ["user1", "user2"], id: "chat02" } ]; for (let i = 0; i < array.length; i++) { array[i].messages = new Array (array[i].messages[array[i].messages.length -1]) } console.log (array)