async-singleton
Usage
import singletonAsync from '@grainrigi/async-singleton';
const func = singletonAsync(function() {
return new Promise(resolve => { console.log('hoge'); resolve(); });
});
(async () => {
func();
func();
await func();
console.log('awaited');
func();
await func();
})();
/* Result
hoge
awaited
hoge
*/Argument comparison and slicing
// function calls with different arguments are not aggregated
import singletonAsync from '@grainrigi/async-singleton';
const func = singletonAsync(function(arg1) {
return new Promise(resolve => { console.log(arg1); resolve(); })
});
func(0);
func(1);
func(2);
/* Result
0
1
2
*/
// compare only sliced range
const func = singletonAsync(function(arg1, arg2) {
return new Promise(resolve => { console.log(arg1, arg2); resolve(); })
}, { slice: [1, 2] });
func(0, 0);
func(1, 0);
func(1, 1);
/* Result
0 0
1 1
*/Acknowledgement
The implementation is based on shokai/async-singleton.