Matx

Matx is a precision-safe math utility toolkit with deep object path support, ideal for financial and data aggregation tasks. It enhances JavaScript's native Math with precision-aware operations and introduces two object prototype extensions: .pointer() for safe nested access and .scan() for enumerable iteration.

🚀 Installation

npm install matx

📦 Usage

In ES6 module:

import 'matx';

const result = Math.sum(1.1, 2.22); // 3.32

In Browser:

Include the bundled script and use window.Matx:

<script src="matx.js" type="module"></script>
or
await import("/path/matx.js");
Math.acm(...)

🔧 Features

🔹 Math Methods

• Math.sum(...values) – Accumulates with precision.
• Math.diff(a, b) – Subtracts with precision.
• Math.acm(acmObj, srcObj, keys) – Accumulate fields from srcObj into acmObj.
• Math.acms(...) – Subtract version of acm.
• Math.acmd(...) – Divide version of acm.
• Math.float0(x) – Safe float parse.
• Math.bytes(x) – Converts bytes into human-readable units.
• Math.precision(x, p, type) – Applies fixed-point rounding.
• Math.get_precision(x) – Finds decimal precision of a number.

🔸 Object Extensions

.pointer(path[, value])

Access or set deeply nested properties safely.

const obj = {};
obj.pointer("a.b.c", 42);
console.log(obj); // { a: { b: { c: 42 } } }

.scan(callback)

Iterates key-value pairs like Array.prototype.map.

const o = { a: 10, b: 20 };
const keys = o.scan((k, v, i) => `${k}:${v}`);
console.log(keys); // ["a:10", "b:20"]

Array.prototype.having()

This utility adds advanced filtering to arrays:

const COL = [
  { a: 1, b: 2 },
  { a: 2, b: 1 },
  { a: 3, b: 1 },
  { a: 4, b: 5 },
  { a: 5, b: 5 },
  { a: 1, c: { d: 1, e: ["alfa"] } },
  { c: { d: 1, e: ["alfa", "beta"] } }
];

// Filter with object criteria
console.log(COL.having({ b: 5, a: 4 }, { a: [2, 3] }));

// Filter with JS condition expression
console.log(COL.having("${b} > 1 && ${a} > 4"));

// Filter with regex logic
console.log(COL.having("/^5/.test('${b}')"));

// Deep search using $@ pointer notation
console.log(COL.having("[email protected][1] !== undefined || [email protected] > 2"));

Examples

Object .scan() with .pointer Chaining

const dataset = {
  101: { user: { id: 101, name: "Alice", scores: { math: 82 } } },
  102: { user: { id: 102, name: "Bob", scores: { math: 91 } } },
  103: { user: { id: 103, name: "Charlie", scores: { math: 75 } } }
};

const result = dataset.scan(function (key, value) {
  const name = value.pointer("user.name");
  const mathScore = value.pointer("user.scores.math");
  return `User ${name} scored ${mathScore} in math.`;
});

console.log(result);
// [
//   "User Alice scored 82 in math.",
//   "User Bob scored 91 in math.",
//   "User Charlie scored 75 in math."
// ]

Math.acm Aggregation Example

const acm = { total: 0 };
const items = [
  { total: 10 },
  { total: 25 },
  { total: 5 }
];

Math.acm(acm, items, "total");
console.log(acm); // { total: 40 }

Math.acm with Nested Keys Example

const acm = {};
const records = [
  {
    year_month: "2024-01",
    sales: { online: 100, retail: 200 },
    refunds: { online: 3, retail: 4 }
  },
  {
    year_month: "2024-02",
    sales: { online: 150, retail: 100 },
    refunds: { online: 2, retail: 5 }
  }
];

Math.acm(acm, records, [
  "sales.online",
  "sales.retail",
  "refunds.online",
  "refunds.retail"
]);

console.log(acm);
// {
//   sales: { online: 250, retail: 300 },
//   refunds: { online: 5, retail: 9 }
// }

🔍🧠 Why Matx?

• Zero-dependency
• Precision-safe
• Works with deeply nested objects
• Friendly to financial, scientific, or statistical data models

📄 License

MIT