0.1.4 • Published 5 years ago
babel-plugin-transform-sequence-discriminants v0.1.4
babel-plugin-transform-sequence-discriminants
Transforms switch cases into pattern-matching if-else statements.
Example
const outsideVariable = 'foo';
switch ('foo', 'bar') {
case 'foo', 'boo':
console.log('not a match');
break;
case outsideVariable, 'bar':
console.log('match!');
break;
case (x, y) => 'foobar' === x + y:
console.log('match!');
break;
case (x) => 'FOO' === x.toUpperCase(), 'bar':
console.log('match!');
break;
case 'foo', _:
console.log('match!');
break;
case _, _:
console.log('match!');
break;
default:
console.log('match!');
break;
}
Output:
const outsideVariable = 'foo';
{
const discriminant0 = 'foo',
discriminant1 = 'bar';
if (discriminant0 === 'foo' && discriminant1 === 'boo') {
console.log('not a match');
} else if (discriminant0 === outsideVariable && discriminant1 === 'bar') {
console.log('match!');
} else if (((x, y) => 'foobar' === x + y)(discriminant0, discriminant1)) {
console.log('match!');
} else if ((x => 'FOO' === x.toUpperCase())(discriminant0) && discriminant1 === 'bar') {
console.log('match!');
} else if (discriminant0 === 'foo' && true) {
console.log('match!');
} else if (true && true) {
console.log('match!');
} else {
console.log('match!');
}
}