mathjs

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Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser and offers an integrated solution to work with numbers, big numbers, complex numbers, units, and matrices.

mathjs.org

josdejong/mathjs

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# Function typeof Determine the type of a variable. Function `typeof` recognizes the following types of objects: Object | Returns | Example ---------------------- | ------------- | ------------------------------------------ Array | `'array'` | `math.typeof ([1, 2, 3])` boolean | `'boolean'` | `math.typeof (true)` Date | `'date'` | `math.typeof (new Date())` null | `'null'` | `math.typeof(null)` number | `'number'` | `math.typeof(3.5)` Object | `'object'` | `math.typeof ({a: 2, b: 3})` RegExp | `'regexp'` | `math.typeof (/a regexp/)` string | `'string'` | `math.typeof ('hello world')` undefined | `'undefined'` | `math.typeof(undefined)` math.chaining.Selector | `'selector'` | `math.typeof (math.select(2))` math.type.BigNumber | `'bignumber'` | `math.typeof (math.bignumber('2.3e500'))` math.type.Complex | `'complex'` | `math.typeof (math.complex(2, 3))` math.type.Help | `'help'` | `math.typeof (math.help('sqrt'))` math.type.Index | `'index'` | `math.typeof (math.index(1, 3))` math.type.Matrix | `'matrix'` | `math.typeof (math.matrix([[1,2], [3, 4]]))` math.type.Range | `'range'` | `math.typeof (math.range(0, 10))` math.type.Unit | `'unit'` | `math.typeof (math.unit('45 deg'))` ## Syntax ```js math.typeof(x) ``` ### Parameters Parameter | Type | Description --------- | ---- | ----------- `x` | * | The variable for which to test the type. ### Returns Type | Description ---- | ----------- String | Lower case type, for example 'number', 'string', 'array'. ## Examples ```js math.typeof(3.5); // returns 'number' math.typeof(math.complex('2 - 4i')); // returns 'complex' math.typeof(math.unit('45 deg')); // returns 'unit' math.typeof('hello world'); // returns 'string' ```