Add prepend util

2025-11-12 11:06:13 -08:00
parent cc17711dc0
commit 24860c9a02
2 changed files with 11 additions and 0 deletions
@@ -430,6 +430,14 @@ export const concat = <T>(...xs: T[][]) => xs.flatMap(x => (x === undefined ? []
 */
 export const append = <T>(x: T, xs: Iterable<T>) => concat(Array.from(xs), [x])

+/**
+ * Prepends element to array
+ * @param x - Element to prepend
+ * @param xs - Array to prepend to
+ * @returns New array with element prepended
+ */
+export const prepend = <T>(x: T, xs: Iterable<T>) => concat([x], Array.from(xs))
+
 /**
 * Creates union of two arrays
 * @param a - First array