javascript array.reduce example
Example 1: reduce javascript
const sum = array.reduce((accumulator, element) => {
return accumulator + element;
}, 0);
const product = array.reduce((accumulator, element) => {
return accumulator * element;
}, 1);
Example 2: javascript sum array values
function getArraySum(a){
var total=0;
for(var i in a) {
total += a[i];
}
return total;
}
var payChecks = [123,155,134, 205, 105];
var weeklyPay= getArraySum(payChecks);
Example 3: reduce object to array javascript
var arr = [{x:1},{x:2},{x:4}];
arr.reduce(function (a, b) {
return {x: a.x + b.x};
})
arr.reduce((a, b) => ({x: a.x + b.x}));
Example 4: syntax of reduce in js
[1,2,3,4,5].reduce((acc, current)=>acc+current, 0)
Example 5: .reduce mdn
arr.reduce(callback( accumulator, currentValue[, index[, array]] )[, initialValue])
Example 6: reduce javascript
const sum = array.reduce((accumulator, element[, idx[, sourceArray]]) => {
return accumulator + idx * 2 + element
}, 0);