删除复杂对象中的元素

Question

我有一个像这样的复杂对象：在 Sentences 对象的每个属性中，我们有一个名为 extensions 的数组，我想删除其中的对象...// Sentences defined for the whole courseconst Sentences = {    /******** ---Sentence Start--- ********/    1: {        type: 'sentence-chunk',        duration: { start: 32.281, end: 34.608 },        difficulty: 2,        clipSentence: {            threshold: 40,            reference: "Your Majesty,* they're* ready.",            expect: "expects_sentences"        },        extensions: [            {                threshold: 41,                reference: "reference_sentence",                expect: "expects_sentences"            },            {                threshold: 42,                reference: "reference_sentence",                expect: "expects_sentences"            },            {                threshold: 43,                reference: "reference_sentence",                expect: "expects_sentences"            },        ],    },     /******** ---Sentence End--- ********/    /******** ---Sentence Start--- ********/    2: {        type: 'sentence-chunk',        duration: { start: 32.281, end: 34.608 },        difficulty: 2,        clipSentence: {            threshold: 40,            reference: "Your Majesty,* they're* ready.",            expect: "expects_sentences"        },        extensions: [            {                threshold: 41,                reference: "Your Highness,* they're* ready.",                expect: "expects_sentences"            },            {                threshold: 42,                reference: "Your Majesty,* the guests are* ready.",                expect: "expects_sentences"            },            {                threshold: 43,                reference: "Your Majesty,* they're* ready.",                expect: "expects_sentences"            },        ],    },     /******** ---Sentence End--- ********/}如果引用属性等于reference_sentence，我想删除扩展数组内的对象。但我编写的代码无法正常工作，并且其中一个对象保持不变！我怎样才能解决这个问题？

Answer 1

当您进行拼接时 - 您从数组中删除对象，这意味着您更改了它的长度以及剩余元素的索引。

所以你应该做的是，当你拼接时，你只需通过简单地递减你的值来“返回一次迭代” i：

// Sentences defined for the whole course

const Sentences = {

    /******** ---Sentence Start--- ********/

    1: {

        type: 'sentence-chunk',

        duration: { start: 32.281, end: 34.608 },

        difficulty: 2,

        clipSentence: {

            threshold: 40,

            reference: "Your Majesty,* they're* ready.",

            expect: "expects_sentences"

        },

        extensions: [

            {

                threshold: 41,

                reference: "reference_sentence",

                expect: "expects_sentences"

            },

            {

                threshold: 42,

                reference: "reference_sentence",

                expect: "expects_sentences"

            },

            {

                threshold: 43,

                reference: "reference_sentence",

                expect: "expects_sentences"

            },

        ],

    }, 

    /******** ---Sentence End--- ********/

    /******** ---Sentence Start--- ********/

    2: {

        type: 'sentence-chunk',

        duration: { start: 32.281, end: 34.608 },

        difficulty: 2,

        clipSentence: {

            threshold: 40,

            reference: "Your Majesty,* they're* ready.",

            expect: "expects_sentences"

        },

        extensions: [

            {

                threshold: 41,

                reference: "Your Highness,* they're* ready.",

                expect: "expects_sentences"

            },

            {

                threshold: 42,

                reference: "Your Majesty,* the guests are* ready.",

                expect: "expects_sentences"

            },

            {

                threshold: 43,

                reference: "Your Majesty,* they're* ready.",

                expect: "expects_sentences"

            },

        ],

    }, 

    /******** ---Sentence End--- ********/

}

modifySentences();

  console.log(Sentences);

  function modifySentences() {

    for (const [key, sentence] of Object.entries(Sentences)) {

        for(let i = 0; i < sentence.extensions.length; i++) {

           if(sentence.extensions[i].reference === 'reference_sentence') {

            console.log(i)

            sentence.extensions.splice(i, 1);

            --i; //here it is, you resetting index back, so you could check next object

          }

        }

    }

  }

Answer 2

简单的数组映射和过滤方法就可以完成您的工作。

const Sentences = {

  1: {

    type: 'sentence-chunk',

    duration: { start: 32.281, end: 34.608 },

    difficulty: 2,

    clipSentence: {

      threshold: 40,

      reference: "Your Majesty,* they're* ready.",

      expect: 'expects_sentences',

    },

    extensions: [

      {

        threshold: 41,

        reference: 'reference_sentence',

        expect: 'expects_sentences',

      },

      {

        threshold: 42,

        reference: 'reference_sentence',

        expect: 'expects_sentences',

      },

      {

        threshold: 43,

        reference: 'reference_sentence',

        expect: 'expects_sentences',

      },

    ],

  },

  2: {

    type: 'sentence-chunk',

    duration: { start: 32.281, end: 34.608 },

    difficulty: 2,

    clipSentence: {

      threshold: 40,

      reference: "Your Majesty,* they're* ready.",

      expect: 'expects_sentences',

    },

    extensions: [

      {

        threshold: 41,

        reference: "Your Highness,* they're* ready.",

        expect: 'expects_sentences',

      },

      {

        threshold: 42,

        reference: 'Your Majesty,* the guests are* ready.',

        expect: 'expects_sentences',

      },

      {

        threshold: 43,

        reference: "Your Majesty,* they're* ready.",

        expect: 'expects_sentences',

      },

    ],

  },

};

const ret = Object.entries(Sentences).map(([, sentence]) => {

  sentence.extensions = sentence.extensions.filter(

    (x) => x.reference !== 'reference_sentence'

  );

  return sentence;

});

console.log(ret);

Answer 3

你可以尝试

function modifySentences() {

    for (const key of Object.keys(Sentences)) {

      if (Sentences.hasOwnProperty(key)) {

         Sentences[key].extensions = Sentences[key].extensions.filter(ext => ext.reference !== "reference_sentence")

      }

    }

}

需要 hasOwnProperty() 检查，以便仅迭代您定义的那些属性。