如何根据其内容选择数组？

Question

对于下面的示例，我想选择附件值，如果它的类型为“预期结算日期”？我试过这样做：state.form.conditions[[4]].attachmentsvar state = {    form: {        conditions: [{            exists: '',            attachments: [],            type: 'Finance',            description: '',            status: 'In Progress',            date: ''        }, {            exists: '',            attachments: [],            type: 'Valuation',            description: '',            status: 'In Progress',            date: ''        }, {            exists: '',            attachments: [],            type: 'Inspection',            description: '',            status: 'In Progress',            date: ''        }, {            exists: '',            attachments: [],            type: 'Other Sale',            description: '',            status: 'In Progress',            date: ''        }, {            exists: 'true',            **attachments: [],**            type: 'Anticipated Settlement Date',            description: '',            status: 'In Progress',            date: ''        }],        rejection_reason: '',    },    progress: false,    editable: true,    commercialLease: false,    redirecting: false,    formErrors: { }};export { state };

Answer 1

使用Array#find：

const {attachments} = state.form.conditions.find(({type})=>type==='Anticipated Settlement Date');

Answer 2

Array.filter+Array.map是一种传统方法：

var state = {

  form: {

    conditions: [{

      exists: '',

      attachments: [],

      type: 'Finance',

      description: '',

      status: 'In Progress',

      date: ''

    }, {

      exists: '',

      attachments: [],

      type: 'Valuation',

      description: '',

      status: 'In Progress',

      date: ''

    }, {

      exists: '',

      attachments: [],

      type: 'Inspection',

      description: '',

      status: 'In Progress',

      date: ''

    }, {

      exists: '',

      attachments: [],

      type: 'Other Sale',

      description: '',

      status: 'In Progress',

      date: ''

    }, {

      exists: 'true',

      attachments: [ 'select me!' ],

      type: 'Anticipated Settlement Date',

      description: '',

      status: 'In Progress',

      date: ''

    }],

    rejection_reason: '',

  },

  progress: false,

  editable: true,

  commercialLease: false,

  redirecting: false,

  formErrors: {}

};

let sel = state

    .form

    .conditions

    .filter(item => item.type == 'Anticipated Settlement Date')

    .map(item => item.attachments);

console.log(sel);