javascript sum array values by key
var array = [
{name: "Peter", age: 43},
{name: "John", age: 32},
{name: "Jake", age: 21}
];
array.reduce(function(sum, current) {
return sum + current.age;
}, 0); // 43 + 32 + 21 = 96javascript sum array values by key
var array = [
{name: "Peter", age: 43},
{name: "John", age: 32},
{name: "Jake", age: 21}
];
array.reduce(function(sum, current) {
return sum + current.age;
}, 0); // 43 + 32 + 21 = 96javascript group by sum array reduce
var array = [
{ Id: "001", qty: 1 },
{ Id: "002", qty: 2 },
{ Id: "001", qty: 2 },
{ Id: "003", qty: 4 }
];
var result = [];
array.reduce(function(res, value) {
if (!res[value.Id]) {
res[value.Id] = { Id: value.Id, qty: 0 };
result.push(res[value.Id])
}
res[value.Id].qty += value.qty;
return res;
}, {});
console.log(result)Copyright © 2021 Codeinu
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