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mathjs

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Math.js is an extensive math library for JavaScript and Node.js. It features a flexible expression parser with support for symbolic computation, comes with a large set of built-in functions and constants, and offers an integrated solution to work with dif

mathjs.org

josdejong/mathjs

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<!-- Note: This file is automatically generated from source code comments. Changes made in this file will be overridden. --> # Function typeof Determine the type of a variable. Function `typeof` recognizes the following types of objects: Object | Returns | Example ---------------------- | ------------- | ------------------------------------------ null | `'null'` | `math.typeof(null)` number | `'number'` | `math.typeof(3.5)` boolean | `'boolean'` | `math.typeof(true)` string | `'string'` | `math.typeof('hello world')` Array | `'Array'` | `math.typeof([1, 2, 3])` Date | `'Date'` | `math.typeof(new Date())` Function | `'Function'` | `math.typeof(function () {})` Object | `'Object'` | `math.typeof({a: 2, b: 3})` RegExp | `'RegExp'` | `math.typeof(/a regexp/)` undefined | `'undefined'` | `math.typeof(undefined)` math.type.BigNumber | `'BigNumber'` | `math.typeof(math.bignumber('2.3e500'))` math.type.Chain | `'Chain'` | `math.typeof(math.chain(2))` math.type.Complex | `'Complex'` | `math.typeof(math.complex(2, 3))` math.type.Fraction | `'Fraction'` | `math.typeof(math.fraction(1, 3))` math.type.Help | `'Help'` | `math.typeof(math.help('sqrt'))` 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.ResultSet | `'ResultSet'` | `math.typeof(math.eval('a=2\nb=3'))` math.type.Unit | `'Unit'` | `math.typeof(math.unit('45 deg'))` math.expression.node&#8203;.AccessorNode | `'AccessorNode'` | `math.typeof(math.parse('A[2]'))` math.expression.node&#8203;.ArrayNode | `'ArrayNode'` | `math.typeof(math.parse('[1,2,3]'))` math.expression.node&#8203;.AssignmentNode | `'AssignmentNode'` | `math.typeof(math.parse('x=2'))` math.expression.node&#8203;.BlockNode | `'BlockNode'` | `math.typeof(math.parse('a=2; b=3'))` math.expression.node&#8203;.ConditionalNode | `'ConditionalNode'` | `math.typeof(math.parse('x<0 ? -x : x'))` math.expression.node&#8203;.ConstantNode | `'ConstantNode'` | `math.typeof(math.parse('2.3'))` math.expression.node&#8203;.FunctionAssignmentNode | `'FunctionAssignmentNode'` | `math.typeof(math.parse('f(x)=x^2'))` math.expression.node&#8203;.FunctionNode | `'FunctionNode'` | `math.typeof(math.parse('sqrt(4)'))` math.expression.node&#8203;.IndexNode | `'IndexNode'` | `math.typeof(math.parse('A[2]').index)` math.expression.node&#8203;.ObjectNode | `'ObjectNode'` | `math.typeof(math.parse('{a:2}'))` math.expression.node&#8203;.ParenthesisNode | `'ParenthesisNode'` | `math.typeof(math.parse('(2+3)'))` math.expression.node&#8203;.RangeNode | `'RangeNode'` | `math.typeof(math.parse('1:10'))` math.expression.node&#8203;.SymbolNode | `'SymbolNode'` | `math.typeof(math.parse('x'))` ## Syntax ```js math.typeof(x) ``` ### Parameters Parameter | Type | Description --------- | ---- | ----------- `x` | * | The variable for which to test the type. ### Returns Type | Description ---- | ----------- string | Returns the name of the type. Primitive types are lower case, non-primitive types are upper-camel-case. For example 'number', 'string', 'Array', 'Date'. ## 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' ```