adjacentCombine - nodef/extra-array GitHub Wiki

Combine adjacent values of an array.

function adjacentCombine(x, fc, acc)
// x:   an array
// fc:  combine function (u, v)
// acc: initial value

const xarray = require('extra-array');

var x = [1, 2, 3, 4];
xarray.adjacentCombine(x, (u, v) => v-u, 0);
// → [ 1, 1, 1, 1 ]

xarray.adjacentCombine(x, (u, v) => u*v, 1);
// → [ 1, 2, 6, 12 ]

xarray.adjacentCombine(x, (u, v) => u+v, 10);
// → [ 11, 3, 5, 7 ]

References