mathjs/src/expression/function/parser.js at develop · husayt/mathjs · GitHub

55 lines (53 loc) · 1.75 KB

import { factory } from '../../utils/factory.js'

const name = 'parser'

const dependencies = ['typed', 'Parser']

export const createParser = /* #__PURE__ */ factory(name, dependencies, ({ typed, Parser }) => {

/**

* Create a `math.Parser` object that keeps a context of variables and their values, allowing the evaluation of expressions in that context.

* Syntax:

* math.parser()

* Examples:

* const parser = new math.parser()

* // evaluate expressions

* const a = parser.evaluate('sqrt(3^2 + 4^2)') // 5

* const b = parser.evaluate('sqrt(-4)') // 2i

* const c = parser.evaluate('2 inch in cm') // 5.08 cm

* const d = parser.evaluate('cos(45 deg)') // 0.7071067811865476

* // define variables and functions

* parser.evaluate('x = 7 / 2') // 3.5

* parser.evaluate('x + 3') // 6.5

* parser.evaluate('f(x, y) = x^y') // f(x, y)

* parser.evaluate('f(2, 3)') // 8

* // get and set variables and functions

* const x = parser.get('x') // 3.5

* const f = parser.get('f') // function

* const g = f(3, 2) // 9

* parser.set('h', 500)

* const i = parser.evaluate('h / 2') // 250

* parser.set('hello', function (name) {

* return 'hello, ' + name + '!'

* })

* parser.evaluate('hello("user")') // "hello, user!"

* // clear defined functions and variables

* parser.clear()

* See also:

* evaluate, compile, parse

* @return {Parser} Parser

return typed(name, {

'': function () {

return new Parser()

}

})

mathjs/src/expression/function/parser.js at develop · husayt/mathjs · GitHub

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