Adds the isNumeric module

md-variables.json

@@ -89,6 +89,21 @@
       "intersect([1, 2, 2, 4, 5], [3, 2, 2, 5, 7]); // [2, 5]  "
     ]
   },
+  "just-is-numeric": {
+    "packageName": "just-is-numeric",
+    "dir": "string-is-numeric",
+    "description": "Checks whether a value is numeric",
+    "examples": [
+      "import isNumeric from 'just-is-numeric';",
+      "",
+      "isNumeric(3); // true",
+      "isNumeric('3'); // true",
+      "isNumeric(3.4); // true",
+      "isNumeric('3.4'); // true",
+      "isNumeric('3.4.5'); // false",
+      "isNumeric('3a'); // false"
+    ]
+  },
   "just-last": {
     "packageName": "just-last",
     "dir": "array-last",

packages/string-is-numeric/LICENSE

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2024 Evandro Goncalves
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

packages/string-is-numeric/README.md

@@ -0,0 +1,29 @@
+<!-- DO NOT EDIT THIS FILE! THIS FILE WAS AUTOGENERATED BY TEMPLATE-MATE -->
+<!-- SEE https://github.com/angus-c/just/blob/master/CONTRIBUTING.md#readme-template -->
+
+## just-is-numeric
+
+Part of a [library](https://anguscroll.com/just) of zero-dependency npm modules that do just do one thing.
+Guilt-free utilities for every occasion.
+
+[`🍦 Try it`](https://anguscroll.com/just/just-is-numeric)
+
+```shell
+npm install just-is-numeric
+```
+```shell
+yarn add just-is-numeric
+```
+
+Checks whether a value is numeric
+
+```js
+import isNumeric from 'just-is-numeric';
+
+isNumeric(3); // true
+isNumeric('3'); // true
+isNumeric(3.4); // true
+isNumeric('3.4'); // true
+isNumeric('3.4.5'); // false
+isNumeric('3a'); // false
+```

packages/string-is-numeric/index.cjs

@@ -0,0 +1,23 @@
+module.exports = isNumeric;
+
+/*
+ isNumeric(""); // false
+ isNumeric("123"); // true
+ isNumeric("123.123"); // true
+ isNumeric("123.123.123"); // false
+ isNumeric("abc"); // false
+ isNumeric("1e8"); // true
+ isNumeric("1e-8"); // true
+ isNumeric("1e-8.1"); // false
+ isNumeric("1aa"); // false
+*/
+
+function isNumeric(str) {
+  var type = typeof str;
+
+  return (
+    (type === 'string' || type === 'number') &&
+    !isNaN(parseFloat(str)) &&
+    isFinite(str)
+  );
+}

packages/string-is-numeric/index.d.ts

@@ -0,0 +1,2 @@
+declare function isNumeric(value: string | number): boolean;
+export default isNumeric;

packages/string-is-numeric/index.mjs

@@ -0,0 +1,25 @@
+var stringIsNumeric = isNumeric;
+
+/*
+ isNumeric(""); // false
+ isNumeric("123"); // true
+ isNumeric("123.123"); // true
+ isNumeric("123.123.123"); // false
+ isNumeric("abc"); // false
+ isNumeric("1e8"); // true
+ isNumeric("1e-8"); // true
+ isNumeric("1e-8.1"); // false
+ isNumeric("1aa"); // false
+*/
+
+function isNumeric(str) {
+  var type = typeof str;
+
+  return (
+    (type === 'string' || type === 'number') &&
+    !isNaN(parseFloat(str)) &&
+    isFinite(str)
+  );
+}
+
+export {stringIsNumeric as isNumeric};

packages/string-is-numeric/index.tests.ts

@@ -0,0 +1,19 @@
+import isNumeric from './index';
+
+// OK
+isNumeric('1');
+isNumeric(1);
+isNumeric('1.1');
+isNumeric(1.1);
+
+// Not OK
+// @ts-expect-error
+isNumeric([]);
+// @ts-expect-error
+isNumeric({});
+// @ts-expect-error
+isNumeric();
+// @ts-expect-error
+isNumeric(false);
+// @ts-expect-error
+isNumeric(null);

packages/string-is-numeric/package.json

@@ -0,0 +1,34 @@
+{
+  "name": "is-numeric",
+  "version": "1.0.0",
+  "description": "Checks whether a value is numeric",
+  "type": "module",
+  "exports": {
+    ".": {
+      "types": "./index.d.ts",
+      "require": "./index.cjs",
+      "import": "./index.mjs"
+    },
+    "./package.json": "./package.json"
+  },
+  "main": "index.cjs",
+  "types": "index.d.ts",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1",
+    "build": "rollup -c"
+  },
+  "repository": "https://github.com/angus-c/just",
+  "keywords": [
+    "number",
+    "string",
+    "float",
+    "integer",
+    "no-dependencies",
+    "just"
+  ],
+  "author": "evandrolg",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/angus-c/just/issues"
+  }
+}

test/string-is-numeric/index.cjs

@@ -0,0 +1,19 @@
+var test = require('../util/test.js')(__filename);
+var isNumeric = require('../../packages/string-is-numeric');
+
+test('detects invalid cases', function(t) {
+  t.false(isNumeric(''));
+  t.false(isNumeric('123.123.123'));
+  t.false(isNumeric('abc'));
+  t.false(isNumeric('1e-8.1'));
+  t.false(isNumeric('1aa'));
+  t.end();
+});
+
+test('detects valid cases', function(t) {
+  t.true(isNumeric('123'));
+  t.true(isNumeric('123.123'));
+  t.true(isNumeric('1e8'));
+  t.true(isNumeric('1e-8'));
+  t.end();
+});