function is not defined when im trying to call a function inside my onsubmit function

i have this form say

<form onSubmit={this.formSubmit} id="userForm" name="myForm" noValidate>

im trying to call another function inside my formsubmit() function but it says the function is not defined . what could the reason be

   formSubmit=(e)=>{
    e.preventDefault();
    validateForm();
  }
  validateForm=()=>{
    console.log("test")
  }

>Solution :

You need to call this.validateForm(). validateForm is bound to the component instance.