import { Component } from '@angular/core';
function hasDifferentArgs(prev: unknown[], next: unknown[]) {
if (prev.length !== next.length) return true;
for (let i = 0; i < prev.length; i++) {
if (!Object.is(prev[i], next[i])) return true;
}
return false;
}
function memo(fnToMemoize) {
let prevArgs = [{}];
let result;
return function (...newArgs) {
if (hasDifferentArgs(prevArgs, newArgs)) {
result = fnToMemoize(...newArgs);
prevArgs = newArgs;
}
return result;
};
}
function expensiveComputing(name: string) {
return '$' + name + '$';
}
@Component({
selector: 'my-app',
template: 'Hello, {{fancyName(name)}}!',
})
export class AppComponent {
name = 'World';
fancyName = memo((name) => expensiveComputing(name));
}
