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javascript/snippets/date-range-generator.md

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+---
+title: Date range generator
+type: snippet
+tags: [date,function,generator]
+cover: portal-timelapse
+dateModified: 2021-06-21T05:00:00-04:00
+---
+
+Creates a generator, that generates all dates in the given range using the given step.
+
+- Use a `while` loop to iterate from `start` to `end`, using `yield` to return each date in the range, using the `Date` constructor.
+- Use `Date.prototype.getDate()` and `Date.prototype.setDate()` to increment by `step` days after returning each subsequent value.
+- Omit the third argument, `step`, to use a default value of `1`.
+
+```js
+const dateRangeGenerator = function* (start, end, step = 1) {
+  let d = start;
+  while (d < end) {
+    yield new Date(d);
+    d.setDate(d.getDate() + step);
+  }
+};
+```
+
+```js
+[...dateRangeGenerator(new Date('2021-06-01'), new Date('2021-06-04'))];
+// [ 2021-06-01, 2021-06-02, 2021-06-03 ]
+```