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snippets/js/s/generate-until.md

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+---
+title: Generate until condition is met
+type: snippet
+language: javascript
+tags: [function,generator]
+author: chalarangelo
+cover: type-stamps
+dateModified: 2022-01-21T05:00:00-04:00
+---
+
+Creates a generator, that keeps producing new values until the given condition is met.
+
+- Initialize the current `val` using the `seed` value.
+- Use a `while` loop to iterate while the `condition` function called with the current `val` returns `false`.
+- Use `yield` to return the current `val` and optionally receive a new seed value, `nextSeed`.
+- Use the `next` function to calculate the next value from the current `val` and the `nextSeed`.
+
+```js
+const generateUntil = function* (seed, condition, next) {
+  let val = seed;
+  let nextSeed = null;
+  while (!condition(val)) {
+    nextSeed = yield val;
+    val = next(val, nextSeed);
+  }
+  return val;
+};
+```
+
+```js
+[...generateUntil(1, v => v > 5, v => ++v)]; // [1, 2, 3, 4, 5]
+```