// Calculate the number of elements in an array
const arr = [1, 5, 5, 3, 1, 5]
const result = arr.reduce((prevState, num) => {
prevState[num] = prevState[num] ? prevState[num] + 1 : 1
return prevState
}, {})
console.log('Result', result)
// Result
{
1: 2,
3: 1,
5: 3
}
// Calculate the number of elements in an array
const arr = [1, 5, 5, 3, 1, 5]
const result = arr.reduce((prevState, num) => {
prevState[num] = prevState[num] ? prevState[num] + 1 : 1
return prevState
}, {})
console.log('Result', result)
// Result
{
1: 2,
3: 1,
5: 3
}
// Calculate the number of elements in an array
const arr = [1, 5, 5, 3, 1, 5]
const result = arr.reduce((prevState, num) => {
prevState[num] = prevState[num] ? prevState[num] + 1 : 1
return prevState
}, {})
console.log('Result', result)
// Result
{
1: 2,
3: 1,
5: 3
}
