@extra-array/symmetric-difference/index.js

Gives values not present in both arrays.

'use strict';
function from$(x) {
    return Array.isArray(x) ? x : [...x];
}
function concat$(x, ...ys) {
    for (var y of ys)
        x.push(...y);
    return x;
}
function id(v) {
    return v;
}
function cmp(a, b) {
    return a < b ? -1 : (a > b ? 1 : 0);
}
function from$$1(x) {
    return Array.isArray(x) ? x : [...x];
}
function from(vs, fm = null) {
    return new Set(fm ? from$$1(vs).map(fm) : vs);
}
function differenceMap(x, y, fm = null) {
    var s = from(y, fm);
    var fm = fm || id;
    var a = [], i = -1;
    for (var u of x) {
        var u1 = fm(u, ++i, x);
        if (!s.has(u1))
            a.push(u);
    }
    return a;
}
function differenceDual(x, y, fc = null, fm = null) {
    var fc = fc || cmp, fm = fm || id;
    var y1 = [...y].map(fm);
    var a = [], i = -1;
    x: for (var u of x) {
        var u1 = fm(u, ++i, x);
        for (var v1 of y1)
            if (fc(u1, v1) === 0)
                continue x;
        a.push(u);
    }
    return a;
}
function difference(x, y, fc = null, fm = null) {
    if (fc)
        return differenceDual(x, y, fc, fm);
    else
        return differenceMap(x, y, fm);
}
function symmetricDifference(x, y, fc = null, fm = null) {
    var x0 = from$(x), y0 = from$(y);
    var ax = difference(x0, y0, fc, fm);
    var ay = difference(y0, x0, fc, fm);
    return concat$(ax, ay);
}
module.exports = symmetricDifference;