feat(checks): add isNumericInt/Float() checks

thi-ng · Jan 7, 2021 · 7e054c1 · 7e054c1
1 parent af5d943
commit 7e054c1
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diff --git a/packages/checks/src/index.ts b/packages/checks/src/index.ts
@@ -41,6 +41,7 @@ export * from "./is-node";
 export * from "./is-not-string-iterable";
 export * from "./is-null";
 export * from "./is-number";
+export * from "./is-numeric";
 export * from "./is-object";
 export * from "./is-odd";
 export * from "./is-plain-object";

diff --git a/packages/checks/src/is-numeric.ts b/packages/checks/src/is-numeric.ts
@@ -0,0 +1,16 @@
+/**
+ * Returns true if given string contains only digits, and optionally, a sign
+ * prefix.
+ *
+ * @param x
+ */
+export const isNumericInt = (x: string) => /^[-+]?\d+$/.test(x);
+
+/**
+ * Returns true if given string only contains an integer or floating point
+ * number, optionally in scientific notiation (e.g. `-123.45e-6`).
+ *
+ * @param x
+ */
+export const isNumericFloat = (x: string) =>
+    /^[-+]?\d*\.?\d+(e[-+]?\d+)?$/i.test(x);