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lerp ​

Problem ​

You need to smoothly interpolate between two values — for example animating a property from start to end over time.

Solution ​

Use lerp(a, b, t) where t=0 returns a, t=1 returns b, and values between interpolate linearly.

ts
import { lerp } from '@vielzeug/arsenal';

lerp(0, 100, 0); // 0
lerp(0, 100, 0.5); // 50
lerp(0, 100, 1); // 100
lerp(0, 100, 0.25); // 25

Pitfalls ​

  • t is not clamped — values outside [0, 1] extrapolate beyond the range. Use clamp(t, 0, 1) if you need to restrict.