accumulate

Produce accumulating values.

Similar: map, filter, reject, reduce, accumulate.

function accumulate(x, fr, acc?)
// x:   an iterable
// fr:  reduce function (acc, v, i, x)
// acc: initial value

const xiterable = require('extra-iterable');

var x = [1, 2, 3, 4];
[...xiterable.accumulate(x, (acc, v) => acc+v)];
// → [1, 3, 6, 10]

[...xiterable.accumulate(x, (acc, v) => acc+v, 100)];
// → [101, 103, 106, 110]

References

• Data.List.scanl: Haskell
• itertools.accumulate: Python