flooent/object.js

Fluent interface to provide an expressive syntax for common manipulations.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.toMap = exports.toEntries = exports.except = exports.only = exports.pull = exports.rename = exports.mapValues = exports.mapKeys = void 0;
/**
 * Iterates the entries through the given callback and assigns each result as the key.
 */
function mapKeys(value, callback) {
    const entries = Object.entries(value);
    const mapped = entries.map(([key, value], index) => [callback(value, key, index), value]);
    return Object.fromEntries(mapped);
}
exports.mapKeys = mapKeys;
/**
 * Iterates the entries through the given callback and assigns each result as the value.
 */
function mapValues(value, callback) {
    const entries = Object.entries(value);
    const mapped = entries.map(([key, value], index) => [key, callback(value, key, index)]);
    return Object.fromEntries(mapped);
}
exports.mapValues = mapValues;
function rename(value, oldKey, newKey) {
    return mapKeys(value, (_, key) => {
        return (key === oldKey) ? newKey : key;
    });
}
exports.rename = rename;
function pull(value, key) {
    const pulled = value[key];
    delete value[key];
    return pulled;
}
exports.pull = pull;
function only(value, keys) {
    return Object.fromEntries(Object.entries(value).filter(([key]) => keys.includes(key)));
}
exports.only = only;
/**
 * Inverse of `only`. Returns a new map with all keys except for the given keys.
 */
function except(value, keys) {
    return Object.fromEntries(Object.entries(value).filter(([key]) => !keys.includes(key)));
}
exports.except = except;
function toEntries(obj) {
    let ownProps = Object.keys(obj);
    let i = ownProps.length;
    let resArray = new Array(i); // preallocate the Array
    while (i--)
        resArray[i] = [ownProps[i], obj[ownProps[i]]];
    return resArray;
}
exports.toEntries = toEntries;
function toMap(obj) {
    const entries = toEntries(obj);
    return new Map(entries);
}
exports.toMap = toMap;