Javascript : How to count occurrence of certain elements in array?

var a=[1.2,3,"3",4,5];
a.search("3")//it should return total number of 3 in given array

 var a=[1.2,3,"3",4,5];


var countd=0;
for( i=0;i<=a.length;i++){ 
 
if(a[i]=="3"){ countd++;} 
 }
console.log(countd);

function findgivenelement(array,elementtofind){
var countd=0;
    for( i=0;i<=array.length;i++){ 
           if(array[i]=="elementtofind"){ countd++;} 
    }
}
var a=[1.2,3,"3",4,5];

findgivenelement(a,"3");

const array1 = ['a','a','a', 'b', 'c'];
var count=0;
array1.forEach(element =>  { (element=='a')?count++:'';});
alert(count);