Using null or undefined for ternary operator formatting in React applications

When styling a component, what should be used if a specific condition is not fulfilled: null, undefined, or something else?

For example:


errorStyle: {
    right: locale === Locales.ARABIC ? 0 : null,
    left: locale !== Locales.ARABIC ? 0 : null,
    ...
},

or


errorStyle: {
    right: locale === Locales.ARABIC ? 0 : undefined,
    left: locale !== Locales.ARABIC ? 0 : undefined,
    ...
},

Answer №1

To achieve the desired effect, you can utilize the unset property. This property resets a CSS style to its inherited value if it naturally inherits from its parent, and to its initial value if not. Your code should look similar to this:

errorStyle: {
    right: locale === Locales.ARABIC ? 0: 'unset',
    left: locale !== Locales.ARABIC ? 0: 'unset',
    ...
}

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