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How does s% reference the title attribute inside the Helmet component? – SEO

Could you help me understand how %s is referencing the <SEO /> component’s title attribute inside the <Helmet /> component in the gatsby starter theme?

https://github.com/gatsbyjs/gatsby-starter-default/blob/master/src/components/seo.js

Line 19:

titleTemplate={`%s | ${data.site.siteMetadata.title}`}
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2

Answers


  1. 0

    The pattern %s is used to be replaced for string:

    const str = 'world';
console.log('Hello %s!', str);
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  2. 0

    $s is inferred from the “title” prop of your component.

    Here is a link to the relevant source code:

    https://github.com/nfl/react-helmet/blob/b79d30ff44c7ff3c175c31059076e5e549a1b402/src/HelmetUtils.js#L27

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