tada5hi/smob

A zero dependency library to safe merge objects and arrays with customizable behavior.

SMOB 🧪

A zero dependency library to safe merge objects and arrays with customizable behavior.

Table of Contents

• Installation
• Usage
  • Merger
  • Utils
• License

Installation

npm install smob --save

Usage

import { merge } from "smob";

const output = merge(...sources);

The following merge options are set by default:

• array: true Merge object array properties.
• arrayDistinct: false Remove duplicates, when merging array elements.
• arrayPriority: left (options.priority) The source aka leftmost array has by default the highest priority.
• clone: false Deep clone input sources.
• inPlace: false Merge sources in place.
• priority: left The source aka leftmost object has by default the highest priority.

The merge behaviour can be changed by creating a custom merger.

Arguments

• sources (any[] | Record<string, any>)[]: The source arrays/objects.

import { merge } from 'smob';

merge({ a: 1 }, { b: 2 }, { c: 3 });
// { a: 1, b: 2, c: 3 }

merge(['foo'], ['bar']);
// ['foo', 'bar']

Merger

A custom merger can simply be created by using the createMerger method.

Array

import { createMerger } from 'smob';

const merge = createMerger({ array: false });

merge({ a: [1,2,3] }, { a: [4,5,6] });
// { a: [1,2,3] }

ArrayDistinct

import { createMerger } from 'smob';

const merge = createMerger({ arrayDistinct: true });

merge({ a: [1,2,3] }, { a: [3,4,5] });
// { a: [1,2,3,4,5] }

Priority

import { createMerger } from 'smob';

const merge = createMerger({ priority: 'right' });

merge({ a: 1 }, { a: 2 }, { a: 3 })
// { a: 3 }

Strategy

import { createMerger } from 'smob';

const merge = createMerger({
    strategy: (target, key, value) => {
        if (
            typeof target[key] === 'number' &&
            typeof value === 'number'
        ) {
            target[key] += value;
            return target;
        }
    }
});

merge({ a: 1 }, { a: 2 }, { a: 3 });
// { a: 6 }

A returned value indicates that the strategy has been applied.

Utils

distinctArray

import { distinctArray } from 'smob';

distnctArray(['foo', 'bar', 'foo']);
// ['foo', 'bar']

The function also removes non-primitive elements that are identical by value or reference.

Objects

import { distinctArray } from 'smob';

distinctArray([{ foo: 'bar' }, { foo: 'bar' }]);
// [{ foo: 'bar' }]

Arrays

import { distinctArray } from 'smob';

distinctArray([['foo', 'bar'], ['foo', 'bar']]);
// [['foo', 'bar']]

isEqual

Checks if two (non-primitive) elements are identical by value or reference.

import { isEqual } from 'smob';

isEqual({foo: 'bar'}, {foo: 'bar'});
// true

isEqual(['foo', 'bar'], ['foo', 'bar']);
// true

License

Made with 💚

Published under MIT License.

smob's Issues

Feature: Array merge strategy

allow custom merge strategy for arrays (namespace/path should be passed to fn)

Feature: Option arrayPriority

Introduce new option arrayPriority to allow custom priority for objects and arrays.