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 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--- ********/

}

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 courseconst Sentences = {&nbsp; &nbsp; /******** ---Sentence Start--- ********/&nbsp; &nbsp; 1: {&nbsp; &nbsp; &nbsp; &nbsp; type: 'sentence-chunk',&nbsp; &nbsp; &nbsp; &nbsp; duration: { start: 32.281, end: 34.608 },&nbsp; &nbsp; &nbsp; &nbsp; difficulty: 2,&nbsp; &nbsp; &nbsp; &nbsp; clipSentence: {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; threshold: 40,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; reference: "Your Majesty,* they're* ready.",&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; expect: "expects_sentences"&nbsp; &nbsp; &nbsp; &nbsp; },&nbsp; &nbsp; &nbsp; &nbsp; extensions: [&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; threshold: 41,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; reference: "reference_sentence",&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; expect: "expects_sentences"&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; },&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; threshold: 42,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; reference: "reference_sentence",&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; expect: "expects_sentences"&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; },&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; threshold: 43,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; reference: "reference_sentence",&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; expect: "expects_sentences"&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; },&nbsp; &nbsp; &nbsp; &nbsp; ],&nbsp; &nbsp; },&nbsp;&nbsp; &nbsp; /******** ---Sentence End--- ********/&nbsp; &nbsp; /******** ---Sentence Start--- ********/&nbsp; &nbsp; 2: {&nbsp; &nbsp; &nbsp; &nbsp; type: 'sentence-chunk',&nbsp; &nbsp; &nbsp; &nbsp; duration: { start: 32.281, end: 34.608 },&nbsp; &nbsp; &nbsp; &nbsp; difficulty: 2,&nbsp; &nbsp; &nbsp; &nbsp; clipSentence: {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; threshold: 40,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; reference: "Your Majesty,* they're* ready.",&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; expect: "expects_sentences"&nbsp; &nbsp; &nbsp; &nbsp; },&nbsp; &nbsp; &nbsp; &nbsp; extensions: [&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; threshold: 41,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; reference: "Your Highness,* they're* ready.",&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; expect: "expects_sentences"&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; },&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; threshold: 42,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; reference: "Your Majesty,* the guests are* ready.",&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; expect: "expects_sentences"&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; },&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; threshold: 43,&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; reference: "Your Majesty,* they're* ready.",&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; expect: "expects_sentences"&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; },&nbsp; &nbsp; &nbsp; &nbsp; ],&nbsp; &nbsp; },&nbsp;&nbsp; &nbsp; /******** ---Sentence End--- ********/}modifySentences();&nbsp; console.log(Sentences);&nbsp; function modifySentences() {&nbsp; &nbsp; for (const [key, sentence] of Object.entries(Sentences)) {&nbsp; &nbsp; &nbsp; &nbsp; for(let i = 0; i < sentence.extensions.length; i++) {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;if(sentence.extensions[i].reference === 'reference_sentence') {&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; console.log(i)&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; sentence.extensions.splice(i, 1);&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; --i; //here it is, you resetting index back, so you could check next object&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; &nbsp; &nbsp; }&nbsp; &nbsp; }&nbsp; }

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 = {&nbsp; 1: {&nbsp; &nbsp; type: 'sentence-chunk',&nbsp; &nbsp; duration: { start: 32.281, end: 34.608 },&nbsp; &nbsp; difficulty: 2,&nbsp; &nbsp; clipSentence: {&nbsp; &nbsp; &nbsp; threshold: 40,&nbsp; &nbsp; &nbsp; reference: "Your Majesty,* they're* ready.",&nbsp; &nbsp; &nbsp; expect: 'expects_sentences',&nbsp; &nbsp; },&nbsp; &nbsp; extensions: [&nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; threshold: 41,&nbsp; &nbsp; &nbsp; &nbsp; reference: 'reference_sentence',&nbsp; &nbsp; &nbsp; &nbsp; expect: 'expects_sentences',&nbsp; &nbsp; &nbsp; },&nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; threshold: 42,&nbsp; &nbsp; &nbsp; &nbsp; reference: 'reference_sentence',&nbsp; &nbsp; &nbsp; &nbsp; expect: 'expects_sentences',&nbsp; &nbsp; &nbsp; },&nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; threshold: 43,&nbsp; &nbsp; &nbsp; &nbsp; reference: 'reference_sentence',&nbsp; &nbsp; &nbsp; &nbsp; expect: 'expects_sentences',&nbsp; &nbsp; &nbsp; },&nbsp; &nbsp; ],&nbsp; },&nbsp; 2: {&nbsp; &nbsp; type: 'sentence-chunk',&nbsp; &nbsp; duration: { start: 32.281, end: 34.608 },&nbsp; &nbsp; difficulty: 2,&nbsp; &nbsp; clipSentence: {&nbsp; &nbsp; &nbsp; threshold: 40,&nbsp; &nbsp; &nbsp; reference: "Your Majesty,* they're* ready.",&nbsp; &nbsp; &nbsp; expect: 'expects_sentences',&nbsp; &nbsp; },&nbsp; &nbsp; extensions: [&nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; threshold: 41,&nbsp; &nbsp; &nbsp; &nbsp; reference: "Your Highness,* they're* ready.",&nbsp; &nbsp; &nbsp; &nbsp; expect: 'expects_sentences',&nbsp; &nbsp; &nbsp; },&nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; threshold: 42,&nbsp; &nbsp; &nbsp; &nbsp; reference: 'Your Majesty,* the guests are* ready.',&nbsp; &nbsp; &nbsp; &nbsp; expect: 'expects_sentences',&nbsp; &nbsp; &nbsp; },&nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; threshold: 43,&nbsp; &nbsp; &nbsp; &nbsp; reference: "Your Majesty,* they're* ready.",&nbsp; &nbsp; &nbsp; &nbsp; expect: 'expects_sentences',&nbsp; &nbsp; &nbsp; },&nbsp; &nbsp; ],&nbsp; },};const ret = Object.entries(Sentences).map(([, sentence]) => {&nbsp; sentence.extensions = sentence.extensions.filter(&nbsp; &nbsp; (x) => x.reference !== 'reference_sentence'&nbsp; );&nbsp; 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。