使用.filter过滤对象数组

Question

If have a JSON object, how can I use.filter to filter my array based on a filters object.

data = [
   {month: 'Sep', name: 'Fred', department: 'Accounting'},
   {month: 'Sep', name: 'David', department: 'Sales'},
   {month: 'Oct', name: 'Jon', department: 'Sales'}
]

filters = {
    month: [],
    name: ['Jon'],
    department: ['Sales','Accounting']
}

Answer 1

 const result = data.filter(entry => {
   for(var key in filters){
     if(filters[key].length && !filters[key].includes(entry[key]) )
        return false;
   }
   return true;
});

You could filter your data by checking every filter's key to exist in the object and that its value is included in the filtering array.

Answer 2

You can do this with filter() and every() methods.

 var data = [ {month: 'Sep', name: 'Fred', department: 'Accounting'}, {month: 'Sep', name: 'David', department: 'Sales'}, {month: 'Oct', name: 'Jon', department: 'Sales'} ] var filters = { month: [], name: ['Jon'], department: ['Sales','Accounting'] } var result = data.filter(e => { return Object.keys(filters).every(f => { return filters[f].includes(e[f]) || !filters[f].length }) }) console.log(result) 

Answer 3

 let data = [ { month: 'Sep', name: 'Fred', department: 'Accounting' }, { month: 'Sep', name: 'David', department: 'Sales' }, { month: 'Oct', name: 'Jon', department: 'Sales' } ]; let filters = { month: [], name: ['Jon'], department: ['Sales', 'Accounting'] }; let matches = data.filter(function (o) { // iterate through keys of filter object for (const key in this) { // if filter array is empty and // value is not in filter array if (this[key].length > 0 && !this[key].includes(o[key])) { // object is not match return false; } } // if object passed every filter array // object is match return true; }, filters); console.log(matches); 

A more compact way of writing it could be like this:

 let data = [ { month: 'Sep', name: 'Fred', department: 'Accounting' }, { month: 'Sep', name: 'David', department: 'Sales' }, { month: 'Oct', name: 'Jon', department: 'Sales' } ]; let filters = { month: [], name: ['Jon'], department: ['Sales', 'Accounting'] }; let matches = data.filter(function (o) { return Object.keys(this).every( key => this[key].length === 0 || this[key].includes(o[key]) ); }, filters); console.log(matches); 

Answer 4

data.filter(obj => filters.month.indexOf(obj.month) > -1 && filters.name.indexOf(obj.name) > -1 && filters.department.indexOf(obj.department) > -1)