easeOutBack math function for 0 is incorrect

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#151 创建于 2022年2月11日 5 条评论 0 个 reaction 已指派 0 人在 GitHub 查看

描述

Using the Math function for easeOutBack: https://easings.net/#easeOutBack

```ts
function easeOutBack(x: number): number {
const c1 = 1.70158;
const c3 = c1 + 1;

return 1 + c3 * pow(x - 1, 3) + c1 * pow(x - 1, 2);
}

console.log(easeOutBack(0))
```

results in `2.220446049250313e-16` whereas it should be `0`

If the calculation is correct then a simple conditional to return `0` when `x === 0` would be necessary.

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