class SignUpForm extends React.Component {
        constructor() {
            super();
            this.state = {
                name: '',
                email: '',
                password: '',

            };
        }

        handleNameChange = (evt) => {
            this.setState({name: evt.target.value});
        }

        handleEmailChange = (evt) => {
            this.setState({email: evt.target.value});
        }

        handlePasswordChange = (evt) => {
            this.setState({password: evt.target.value});
        }
        render(){
            return(
                <form onSubmit={this.handleSubmit}>
                    <input
                        type="text"
                        placeholder="Enter Name"
                        value={this.state.name}
                        onChange={this.handleNameChange}
                    />
                    <input
                        type="text"
                        placeholder="Enter email"
                        value={this.state.email}
                        onChange={this.handleEmailChange}
                    />
                    <input
                        type="password"
                        placeholder="Enter password"
                        value={this.state.password}
                        onChange={this.handlePasswordChange}
                    />
                    <button disabled={isDisabled}>Sign up</button>
                </form>
            )
        }

    }

handleChange = (type, event) => {
   this.setState({[type]: event.target.value});
}

<input
   type="text"
   placeholder="Enter Name"
   value={this.state.name}
   onChange={(event) => this.handleChange('name', event)}
/>

handleChange = type => event => this.setState({[type]: event.target.value})

<input
   type="text"
   placeholder="Enter Name"
   value={this.state.name}
   id="name"
   onChange={this.handleChange('name')}
/>

handleChange = event => this.setState({[event.target.id]: event.target.value})

<input
   type="text"
   placeholder="Enter Name"
   value={this.state.name}
   id="name"
   onChange={this.handleChange}
/>