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babel-plugin-transform-do-expressions
Advanced tools
The babel-plugin-transform-do-expressions package is a Babel plugin that allows you to use 'do expressions' in your JavaScript code. 'Do expressions' enable you to use statements like loops and conditionals in expression contexts, which can be particularly useful for complex logic within JSX or other expression-based syntaxes.
Basic Do Expression
This feature allows you to use conditional logic within an expression. The 'do' expression evaluates the if-else statement and assigns the result to the variable 'result'.
const result = do {
if (x > 10) {
'greater';
} else {
'lesser';
}
};
Do Expression with Loop
This feature allows you to use loops within an expression. The 'do' expression evaluates the for loop and assigns the final value of 'total' to the variable 'sum'.
const sum = do {
let total = 0;
for (let i = 0; i < 5; i++) {
total += i;
}
total;
};
Do Expression in JSX
This feature allows you to use 'do expressions' within JSX. The 'do' expression evaluates the conditional logic and renders either the <Welcome> or <Login> component based on the user's login status.
const element = <div>{do {
if (user.isLoggedIn) {
<Welcome user={user} />;
} else {
<Login />;
}
}}</div>;
This Babel plugin allows you to inline environment variables into your code. While it doesn't provide the same 'do expression' functionality, it is useful for injecting environment-specific values into your code at build time.
This Babel plugin transforms JSX syntax into JavaScript. While it doesn't offer 'do expressions', it is essential for working with JSX in React applications, making it a complementary tool for developers using 'do expressions' within JSX.
Compile do expressions to ES5
$ npm install babel-plugin-transform-do-expressions
.babelrc
(Recommended).babelrc
{
"plugins": ["transform-do-expressions"]
}
$ babel --plugins transform-do-expressions script.js
require("babel-core").transform("code", {
plugins: ["transform-do-expressions"]
});
FAQs
Compile do expressions to ES5
The npm package babel-plugin-transform-do-expressions receives a total of 355,990 weekly downloads. As such, babel-plugin-transform-do-expressions popularity was classified as popular.
We found that babel-plugin-transform-do-expressions demonstrated a not healthy version release cadence and project activity because the last version was released a year ago. It has 6 open source maintainers collaborating on the project.
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