How Much is True?

Create a function which returns the number of true values there are in an array.

Examples

countTrue([true, false, false, true, false]) ➞ 2

countTrue([false, false, false, false]) ➞ 0

countTrue([]) ➞ 0

Notes

Return 0 if given an empty array.
All array items are of the type bool (true or false).

Answer (1)

const countTrue = r => r.filter(Boolean).length

Answer (2)

function countTrue(arr) {
return arr.filter(x=>x==true).length
}

Answer (3)

function countTrue(arr){
   var count = 0;
   for(var i = 0; i < arr.length; i++){
      if(arr[i] === true){
         count++;
      }
   }
   return count;
}

Answer (4)

const countTrue = (arr) => arr.filter(Boolean).length;

Answer (5)

countTrue=a=>a.filter(b=>b).length

Answer (6)

function countTrue(arr) {
let trueCounter = 0;
 
arr.forEach((bool) => {
 if (bool) {
 trueCounter++;
}
});
return trueCounter;
}

Answer (7)

function countTrue(arr) {
   var reducer = (acc, curVal) => acc + curVal;
   return arr.reduce(reducer, 0);
 }

Answer (8)

function countTrue(arr) {

   return arr.filter(x => x === true).length

Answer (9)

function countTrue(arr) {
return arr.reduce((p,v)=>p+v,0);
}

countTrue=a=>a.filter(b=>b).length

Answer (10)

function countTrue(arr) {
   let count=0
    for(let element of arr)
       if(element===true)
          count++
   return count
}

Answer (11)

function countTrue(arr) {
   var n=0, l=arr.length;
   for(var i=0;i<l;i++) if(arr.shift()) n++;
   return n;
}

Answer (12)

function countTrue(arr) {
   return arr.filter(Boolean).length
}

Answer (13)

function countTrue(arr) {
let count = 0;
for(let x of arr){
if(x){
count++;
}
}
 
return count;
}

Answer (14)

function countTrue(arr) {
   let result = new Array();
   for(let i = 0; i < arr.length; i++) {
      if (arr[i] === true) {
         result.push(arr[i]);
      }
   }
   return result.length;
}

Answer (15)

function countTrue(arr) {
   trueCount = 0
   for(element of arr ){
      if (element === true){
         trueCount+=1
      }
      else continue
   }
   return trueCount
}

Answer (16)

function countTrue(arr) {
var count = 0;
arr.filter(function(elem){
if(elem == true)
count+=1
})
return count
}

Answer (17)

countTrue=a=>a.filter(c=>c).length

Answer (18)

function countTrue(arr) {
var count = 0
for (var i = 0; i < arr.length; i++) {
if (arr[i] === true) {
count += 1
}
}
console.log(count)
return count
}

Answer (19)

function countTrue(arr) {
let counter = 0
for (let i = 0; i < arr.length; i++) {
if (arr[i]) {
counter++
}
}
return counter
}

Answer (20)

function countTrue(arr) {
var count=0;
arr.forEach(value =>{
if(value)
{
count++;
}
})
return count;
}

Answer (21)

function countTrue(arr) {
return arr.map( e=> e ? true : false).reduce( (pre, cur)=> pre+cur, 0)
}

Answer (22)

function countTrue(arr) {

return arr.map( e=> e ? true : false).reduce( (pre, cur)=> pre+cur, 0)

}

Answer (23)

function countTrue(arr) {
   function isTrue(e){
     return e===true}
     return arr.filter(isTrue).length
 }

Answer (24)

function countTrue(arr) {
   if (arr.length == 0) return 0;
   let sum = 0;
   for (const i in arr) {
       sum += (arr[i] == true) ? 1 : 0;
   }
   return sum;
}

Answer (25)

function countTrue(arr) {
   var count = 0;
for(var i = 0; i < arr.length; ++i){
   if(arr[i] == true)
       count++;
}
  return count;
}