optix/dist/optix.esm.js

Optix is a data manipulation library that provides optics-like capabilites with a simpler syntax. It features robust Typescript support with minimal type annotations and is smaller and faster than true optics libraries.

const _get = (obj, path) => {
    if (!path.length) {
        return obj;
    }
    const slicedPath = path.slice(1);
    const resolved = typeof path[0] === "function" ? path[0](obj) : path[0];
    return Array.isArray(resolved)
        ? resolved.map((idx) => obj != null ? _get(obj[idx], slicedPath) : undefined)
        : obj != null
            ? _get(obj[resolved], slicedPath)
            : undefined;
};

const _update = (obj, path, updater) => {
    if (!path.length) {
        return updater(obj);
    }
    const slicedPath = path.slice(1);
    const resolved = typeof path[0] === "function" ? path[0](obj) : path[0];
    const keysToUpdate = typeof resolved === "string" || typeof resolved === "number"
        ? [resolved]
        : Array.isArray(resolved)
            ? resolved
            : [];
    // check for invalid path
    const typeofKey0 = typeof keysToUpdate[0];
    if ((typeofKey0 !== "string" && typeofKey0 !== "number") ||
        keysToUpdate[0] < 0) {
        return obj;
    }
    const treatObjAsArray = typeofKey0 === "number";
    const newObj = obj && typeof obj === "object"
        ? treatObjAsArray
            ? obj.slice(0)
            : Object.assign({}, obj)
        : treatObjAsArray
            ? []
            : {};
    for (let i = 0; i < keysToUpdate.length; i++) {
        newObj[keysToUpdate[i]] = _update(newObj[keysToUpdate[i]], slicedPath, updater);
    }
    return newObj;
};

const _set = (object, path, value) => _update(object, path, () => value);

const _remove = (obj, path) => {
    if (!path.length || !obj || typeof obj !== "object") {
        return obj;
    }
    const resolved = typeof path[0] === "function" ? path[0](obj) : path[0];
    const keysToRemove = typeof resolved === "string" || typeof resolved === "number"
        ? [resolved]
        : Array.isArray(resolved)
            ? resolved
            : [];
    // check for invalid path
    const typeofKey0 = typeof keysToRemove[0];
    if ((typeofKey0 !== "string" && typeofKey0 !== "number") ||
        keysToRemove[0] < 0) {
        return obj;
    }
    if (path.length === 1) {
        let newObj;
        if (Array.isArray(obj)) {
            const keySet = new Set(keysToRemove);
            newObj = [];
            for (let i = 0; i < obj.length; i++) {
                if (!keySet.has(i)) {
                    newObj.push(obj[i]);
                }
            }
        }
        else {
            newObj = Object.assign({}, obj);
            for (let i = 0; i < keysToRemove.length; i++) {
                delete newObj[keysToRemove[i]];
            }
        }
        return newObj;
    }
    else {
        const slicedPath = path.slice(1);
        const newObj = Array.isArray(obj) ? obj.slice(0) : Object.assign({}, obj);
        for (let i = 0; i < keysToRemove.length; i++) {
            const keyToRemove = keysToRemove[i];
            if ({}.hasOwnProperty.call(newObj, keyToRemove)) {
                newObj[keyToRemove] = _remove(newObj[keyToRemove], slicedPath);
            }
        }
        return newObj;
    }
};

const last = (arr) => arr.length - 1;
const all = (arr) => arr.map((_, i) => i);
const keys = Object.keys;
const find = (predicate) => (arr) => {
    for (let i = 0; i < arr.length; i++) {
        if (predicate(arr[i]))
            return i;
    }
    return -1;
};
const findByKey = (predicate) => (obj) => {
    for (let i = 0, keys = Object.keys(obj); i < keys.length; i++) {
        if (predicate(keys[i]))
            return keys[i];
    }
};
const findByVal = (predicate) => (obj) => findByKey(key => predicate(obj[key]))(obj);
const filter = (predicate) => (arr) => {
    const filtered = [];
    for (let i = 0; i < arr.length; i++) {
        if (predicate(arr[i]))
            filtered.push(i);
    }
    return filtered;
};
const filterByKey = (predicate) => (obj) => {
    const filtered = [];
    const keys = Object.keys(obj);
    for (let i = 0; i < keys.length; i++) {
        if (predicate(keys[i]))
            filtered.push(keys[i]);
    }
    return filtered;
};
const filterByVal = (predicate) => (obj) => filterByKey(key => predicate(obj[key]))(obj);

const get = (...path) => (obj) => _get(obj, path);
const set = (...path) => (value) => (obj) => _set(obj, path, value);
const update = (...path) => (updater) => (obj) => _update(obj, path, updater);
const remove = (...path) => (obj) => _remove(obj, path);
const polySet = set;
const polyUpdate = update;
const polyRemove = remove;

export { _get, _remove, _set, _update, all, filter, filterByKey, filterByVal, find, findByKey, findByVal, get, keys, last, polyRemove, polySet, polyUpdate, remove, set, update };