I have this java-script array:

var arr1 = [{id:'124',name:'qqq',type=3}, 
            {id:'589',name:'www',type=1}, 
            {id:'45',name:'eee',type=1},
            {id:'567',name:'rrr',type=1},
            {id:'124',name:'qqq',type=2}, 
            {id:'589',name:'ddd',type=2}, 
            {id:'45',name:'qqq',type=1},
            {id:'567',name:'vvv',type=3}]

I need to count items in arr1 array that has type property 1 or 3.

How can I implement it using jQuery?

I have this java-script array:

var arr1 = [{id:'124',name:'qqq',type=3}, 
            {id:'589',name:'www',type=1}, 
            {id:'45',name:'eee',type=1},
            {id:'567',name:'rrr',type=1},
            {id:'124',name:'qqq',type=2}, 
            {id:'589',name:'ddd',type=2}, 
            {id:'45',name:'qqq',type=1},
            {id:'567',name:'vvv',type=3}]

I need to count items in arr1 array that has type property 1 or 3.

How can I implement it using jQuery?

• javascript
• jquery

• 2 arr1.filter(x => x.type === 1 || x.type === 3).length – haim770 Commented May 23, 2017 at 11:58
• @haim770 answer the question so i can upvote and the OP can chose it – 404answernotfound Commented May 23, 2017 at 11:59
• I'm sure you've been on SO long enough to at least try something, there are a lot of questions pertaining to the exact question you are asking as well.... – epoch Commented May 23, 2017 at 12:01
• invalid shorthand property for @haim770 – Death-is-the-real-truth Commented May 23, 2017 at 12:01
• this question has lots of duplicates already, OP should remove it (and search before asking) – user5734311 Commented May 23, 2017 at 12:04

6 Answers 6

var arr1 = [{id:'124',name:'qqq',type=3}, 
            {id:'589',name:'www',type=1}, 
            {id:'45',name:'eee',type=1},
            {id:'567',name:'rrr',type=1},
            {id:'124',name:'qqq',type=2}, 
            {id:'589',name:'ddd',type=2}, 
            {id:'45',name:'qqq',type=1},
            {id:'567',name:'vvv',type=3}];

var count = arr.filter(item => item.type === 3 || item.type === 1).length;

You could use Array#reduce with a check and add the value of the parison.

var array = [{ id: '124', name: 'qqq', type: 3 }, { id: '589', name: 'www', type: 1 }, { id: '45', name: 'eee', type: 1 }, { id: '567', name: 'rrr', type: 1 }, { id: '124', name: 'qqq', type: 2 }, { id: '589', name: 'ddd', type: 2 }, { id: '45', name: 'qqq', type: 1 }, { id: '567', name: 'vvv', type: 3 }],
    count = array.reduce(function (r, a) {
        return r + +(a.type === 1 || a.type === 3);
    }, 0);
    
console.log(count);

var len = $.grep(arr1, (o)=> {
    return o.type === 1 || o.type === 3;
}).length;

You can call the following function:

function count(arr) {   
  return $.grep(arr, function( n ) {
     return ( (n.type === 1) || (n.type === 3) );
  }).length;
}

with your array:

count(arr1);

try this code,

var arr1 =[{ id: '124', name: 'qqq', type: 3 }, { id: '589', name: 'www', type: 1 }, { id: '45', name: 'eee', type: 1 }, { id: '567', name: 'rrr', type: 1 }, { id: '124', name: 'qqq', type: 2 }, { id: '589', name: 'ddd', type: 2 }, { id: '45', name: 'qqq', type: 1 }, { id: '567', name: 'vvv', type: 3 }]
                
var count = 0;
arr1.forEach(function(e) {
  if (e.type == 1 || e.type == 3 ) 
   {
       count++;
   }
 });

alert(count);

will get the count of property type 1 and 3 in Variable "count"

function btnSaveClick() {
    for (let i = 0; i < vm.kanoonCourses.length; i++) {
        let cnt = 0;
        cnt += vm.courses.filter(c => c.KanoonCourseTitle == vm.kanoonCourses[i]).length;
        if (cnt > 1) {
            toastr.error("Duplicate course!");
            return;
        }
        else {
           // save data
        }
    }
}