18 lines
467 B
JavaScript
18 lines
467 B
JavaScript
function reduce(set, callback, initialValue) {
|
|
if (initialValue == null && set.size === 0) {
|
|
throw new TypeError('Reduce of empty set with no initial value');
|
|
}
|
|
let accumulator = initialValue;
|
|
for (const value of set) {
|
|
if (accumulator == null) {
|
|
accumulator = value;
|
|
}
|
|
else {
|
|
accumulator = callback(accumulator, value, value, set);
|
|
}
|
|
}
|
|
return accumulator;
|
|
}
|
|
|
|
export { reduce };
|