default class

[craigcosmo]

classbtn = classnames({
    foo: this.state.status
})

<button className={classbtn}>submit</button>

From the code above, we have the classbtn will not return anything if this.state.status is false

What if we want it to return class bar if this.state.status is false?

[craigcosmo]

Well it's pretty simple

classbtn = classnames({
    foo: this.state.status,
    bar: !this.state.status
})

<button className={classbtn}>submit</button>