feat(strings): add charRange(), add radix & zero-pad presets

thi-ng · Sep 10, 2019 · c9e5a63 · c9e5a63
1 parent ae1ec8d
commit c9e5a63
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Showing 4 changed files with 46 additions and 0 deletions.
diff --git a/packages/strings/src/index.ts b/packages/strings/src/index.ts
@@ -9,6 +9,7 @@ export * from "./pad-right";
 export * from "./parse";
 export * from "./percent";
 export * from "./radix";
+export * from "./range";
 export * from "./repeat";
 export * from "./slugify";
 export * from "./splice";

diff --git a/packages/strings/src/pad-left.ts b/packages/strings/src/pad-left.ts
@@ -20,3 +20,18 @@ export const padLeft: (
             ? ((x = x.toString()), x.length < n ? buf.substr(x.length) + x : x)
             : buf;
 });
+
+/**
+ * Zero-padded 2 digit formatter.
+ */
+export const Z2 = padLeft(2, "0");
+
+/**
+ * Zero-padded 3 digit formatter.
+ */
+export const Z3 = padLeft(3, "0");
+
+/**
+ * Zero-padded 4 digit formatter.
+ */
+export const Z4 = padLeft(4, "0");
diff --git a/packages/strings/src/radix.ts b/packages/strings/src/radix.ts
@@ -29,6 +29,16 @@ export const radix: (
  */
 export const B8 = radix(2, 8);
 
+/**
+ * 16bit binary conversion preset.
+ */
+export const B16 = radix(2, 16);
+
+/**
+ * 32bit binary conversion preset.
+ */
+export const B32 = radix(2, 32);
+
 /**
  * 8bit hex conversion preset.
  * Assumes unsigned inputs.

diff --git a/packages/strings/src/range.ts b/packages/strings/src/range.ts
@@ -0,0 +1,20 @@
+/**
+ * Yields iterator of characters [`from`..`to`] (inclusive). Uses
+ * reverse ordering if `to` < `from`.
+ *
+ * @param from
+ * @param to
+ */
+export function* charRange(from: string | number, to: string | number) {
+    let i = typeof from === "string" ? from.charCodeAt(0) : from;
+    const end = typeof to === "string" ? to.charCodeAt(0) : to;
+    if (i <= end) {
+        for (; i <= end; i++) {
+            yield String.fromCharCode(i);
+        }
+    } else {
+        for (; i >= end; i--) {
+            yield String.fromCharCode(i);
+        }
+    }
+}