84 lines
1.9 KiB
Markdown
Executable File
84 lines
1.9 KiB
Markdown
Executable File
## Lerp
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```js
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function lerp(a, b, v){
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return a*v+b*(1-v);
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}
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```
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## Easing Functions
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```js
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// accelerating from zero velocitieee
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function easeInQuad(t) { return t*t }
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// decelerating to zero velocity
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function easeOutQuad(t) { return t*(2-t) }
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// acceleration until halfway, then deceleration
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function easeInOutQuad(t) { return t<.5 ? 2*t*t : -1+(4-2*t)*t }
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// accelerating from zero velocity
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function easeInCubic(t) { return t*t*t }
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// decelerating to zero velocity
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function easeOutCubic(t) { return (--t)*t*t+1 }
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// acceleration until halfway, then deceleration
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function easeInOutCubic(t) { return t<.5 ? 4*t*t*t : (t-1)*(2*t-2)*(2*t-2)+1 }
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// accelerating from zero velocity
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function easeInQuart(t) { return t*t*t*t }
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// decelerating to zero velocity
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function easeOutQuart(t) { return 1-(--t)*t*t*t }
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// acceleration until halfway, then deceleration
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function easeInOutQuart(t) { return t<.5 ? 8*t*t*t*t : 1-8*(--t)*t*t*t }
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// accelerating from zero velocity
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function easeInQuint(t) { return t*t*t*t*t }
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// decelerating to zero velocity
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function easeOutQuint(t) { return 1+(--t)*t*t*t*t }
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// acceleration until halfway, then deceleration
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function easeInOutQuint(t) { return t<.5 ? 16*t*t*t*t*t : 1+16*(--t)*t*t*t*t }
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```
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## Chunk Array
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```javascript
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function chunk(arr, chunkSize) {
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const R = [];
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for (let i=0,len=arr.length; i<len; i+=chunkSize)
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R.push(arr.slice(i,i+chunkSize));
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return R;
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}
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```
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## Size of String
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```js
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function byteCount(s) {
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return encodeURI(s).split(/%..|./).length - 1;
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}
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```
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## Debounce
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```js
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function debounce(func, wait, immediate) {
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var timeout;
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return function () {
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var context = this, args = arguments;
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var later = function () {
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timeout = null;
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if (!immediate) func.apply(context, args);
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};
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var callNow = immediate && !timeout;
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clearTimeout(timeout);
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timeout = setTimeout(later, wait);
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if (callNow) func.apply(context, args);
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};
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};
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```
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