Function customFunction

test/unit-tests/expression/node/ParenthesisNode.test.js:156–160

(node, options)

  it('should stringify a ParenthesisNode with custom toString', function () {
    const customFunction = function (node, options) {
      if (node.type === 'ParenthesisNode') {
        return '[' + node.content.toString(options) + ']'
      }
    }

    const c = new math.ConstantNode(1)
    const n = new math.ParenthesisNode(c)