exclusiveScan (original) (raw)
Perform exclusive prefix scan from left to right.
Alternatives: exclusiveScan, exclusiveScan$.
Similar: inclusiveScan, exclusiveScan.
function exclusiveScan(x, fr, acc) // x: an array // fr: reduce function (acc, v, i, x) // acc: initial value
const xarray = require('extra-array');
var x = [1, 2, 3, 4, 5]; var y = xarray.exclusiveScan(x, (acc, v) => acc+v, 0); // → [ 0, 1, 3, 6, 10 ]
var y = xarray.exclusiveScan(x, (acc, v) => acc+v, 10); // → [ 10, 11, 13, 16, 20 ]