mathjs/docs/reference/functions/eval.md

Function eval

Evaluate an expression.

Note the evaluating arbitrary expressions may involve security risks, see http://mathjs.org/docs/expressions/security.html for more information.

Syntax

math.eval(expr)
math.eval(expr, scope)
math.eval([expr1, expr2, expr3, ...])
math.eval([expr1, expr2, expr3, ...], scope)

Parameters

Parameter	Type	Description
expr	string | string[] | Matrix	The expression to be evaluated
scope	Object	Scope to read/write variables

Returns

Type	Description

• | The result of the expression

Examples

math.eval('(2+3)/4')                // 1.25
math.eval('sqrt(3^2 + 4^2)')        // 5
math.eval('sqrt(-4)')               // 2i
math.eval(['a=3', 'b=4', 'a*b'])    // [3, 4, 12]

let scope = {a:3, b:4}
math.eval('a * b', scope)           // 12

See also

parse, compile