What is t inside the double braces in Vue?

Vue.js is a popular JavaScript framework that allows us to create complex web applications. In Vue.js, we can bind data to HTML templates through double curly braces. However, we may get confused when we see a t inside double curly braces. So, what is t inside the double braces of Vue?

In Vue.js, double braces can be used for interpolation. Interpolation is the process of injecting values ​​from an expression into HTML elements. Expressions can be variables, calculation expressions, functions, etc.

For example, we can bind a data in Vue.js like this:

<div>
  {{ message }}
</div>

In this example, we use double curly brackets to insert a variable message into the HTML template. When the message value in the Vue.js instance changes, the interpolation value is updated accordingly.

However, in some cases, we will see a t in double curly brackets, for example:

<div>
  {{ t('Hello World') }}
</div>

Here, t is a function call, not a variable name. The t function is often used as part of internationalization (i18n). i18n is the transformation and adaptation technology developers need to make application text available in multiple languages. The purpose of the

t function is to obtain the text translation in the current locale of the application so that it can be inserted into the HTML template. In common i18n libraries, this function is generally named $t or gettext.

For example, we can use the vue-i18n i18n library in Vue.js to use the t function:

<div>
  {{ $t('Hello World') }}
</div>

In the above example, the $t function will get the current locale The "Hello World" text is translated and inserted into the HTML template. In this way, we can easily implement multi-language support.

In short, when we see t in double curly braces in Vue.js, it is usually a function provided by the i18n library to get the text translation and insert it into the HTML template.

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