javaScript сумма массива
const sum = arr => arr.reduce((a, b) => a + b, 0);
Batman
const sum = arr => arr.reduce((a, b) => a + b, 0);let array = [36, 25, 6, 15];
array.reduce((acc, curr) => acc + curr, 0)
// 36 + 25 + 6 + 15 = 82var array = [36, 25, 6, 15];
array.reduce(function(accumulator, currentValue) {
return accumulator + currentValue;
}, 0); // 36 + 25 + 6 + 15 = 82reduce function sample solution// Reduce in javascript advance
// output: { '22': 2, '24': 2, '26': 1 }
const user = [
{name:"Abhishek",age:24},
{name:"Dhruval",age:22},
{name:"Anish",age:26},
{name:"Aakash",age:22},
{name:"Darshil",age:24},
]
const newUser = user.reduce((acc,cur)=>{
if(acc[cur.age]){
acc[cur.age] = acc[cur.age] +1
}
else{
acc[cur.age] = 1
}
return acc;
},{})
console.log(newUser)
// Arrow function
reduce((previousValue, currentValue) => { /* ... */ } )
reduce((previousValue, currentValue, currentIndex) => { /* ... */ } )
reduce((previousValue, currentValue, currentIndex, array) => { /* ... */ } )
reduce((previousValue, currentValue, currentIndex, array) => { /* ... */ }, initialValue)
// Callback function
reduce(callbackFn)
reduce(callbackFn, initialValue)
// Inline callback function
reduce(function(previousValue, currentValue) { /* ... */ })
reduce(function(previousValue, currentValue, currentIndex) { /* ... */ })
reduce(function(previousValue, currentValue, currentIndex, array) { /* ... */ })
reduce(function(previousValue, currentValue, currentIndex, array) { /* ... */ }, initialValue)