mathjs/docs/reference/functions/parse.md

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.

# Function parse

Parse an expression. Returns a node tree, which can be evaluated by
invoking node.eval();


## Syntax

```js
parse(expr)
parse(expr, options)
parse([expr1, expr2, expr3, ...])
parse([expr1, expr2, expr3, ...], options)
```

### Parameters

Parameter | Type | Description
--------- | ---- | -----------
`expr` | String | String[] | Matrix | Expression to be parsed
`options` | {nodes: Object<String, Node>} | Available options: - `nodes` a set of custom nodes

### Returns

Type | Description
---- | -----------
Node &#124; Node[] | node


## Examples

```js
var node = parse('sqrt(3^2 + 4^2)');
node.compile(math).eval(); // 5

var scope = {a:3, b:4}
var node = parse('a * b'); // 12
var code = node.compile(math);
code.eval(scope); // 12
scope.a = 5;
code.eval(scope); // 20

var nodes = math.parse(['a = 3', 'b = 4', 'a * b']);
nodes[2].compile(math).eval(); // 12
```




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