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import { test, assert} from '../test-assert.js';
import { useAverage, clamp, lerp } from './Util.js';
test('Average correctly accumulates an average', () => {
let [avg, avg_append] = useAverage();
let data = [];
for (let i=0; i<5000; i++) {
let d = Math.random();
data.push(d);
avg_append(d);
}
let manual_average = 0;
for (let d of data) manual_average += d;
manual_average /= data.length;
const precision = (decimalPlaces, num) => {
const theta = 10**decimalPlaces;
return Math.floor(num * theta) / theta;
};
assert.equal(precision(5, avg()), precision(5, manual_average));
});
test('Clamp correctly constrains values', () => {
assert.equal(clamp(5, 0, 10), 5);
assert.equal(clamp(-1, 0, 10), 0);
assert.equal(clamp(15, 0, 10), 10);
});
test ('Lerp correctly interpolates values', () => {
const a = 15;
const b = 10;
assert.equal(lerp(a, b, 0), a);
assert.equal(lerp(a, b, 1), b);
assert.equal(lerp(a, b, 0.5), (a+b)/2);
assert.equal(lerp(a, b, 0.25), (3*a + b)/4);
assert.equal(lerp(a, b, 0.75), (a + (3*b))/4);
});
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