mathjs/examples/objects.js at develop · sophy1/mathjs · GitHub

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// objects

import { evaluate, format } from '../lib/esm/index.js'

// create an object. Keys can be symbols or strings

print(evaluate('{x: 2 + 1, y: 4}')) // {"x": 3, "y": 4}

print(evaluate('{"name": "John"}')) // {"name": "John"}

// create an object containing an object

print(evaluate('{a: 2, b: {c: 3, d: 4}}')) // {"a": 2, "b": {"c": 3, "d": 4}}

const scope = {

obj: {

prop: 42

}

// retrieve properties using dot notation or bracket notation

print(evaluate('obj.prop', scope)) // 42

print(evaluate('obj["prop"]', scope)) // 42

// set properties (returns the whole object, not the property value!)

print(evaluate('obj.prop = 43', scope)) // 43

print(evaluate('obj["prop"] = 43', scope)) // 43

print(scope.obj) // {"prop": 43}

/**

* Helper function to output a value in the console. Value will be formatted.

* @param {*} value

function print (value) {

const precision = 14

console.log(format(value, precision))

}

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