feat(checks): add new predicates, refactor existing

- add: isBlob, isEven, isFile, isInRange, isOdd, isRegExp - add: hasMinLength, hasMaxLength - update: existsAndNotNull, isArray, isArrayLike
thi-ng · Feb 8, 2018 · 68f8fc2 · 68f8fc2
1 parent 080c2ee
commit 68f8fc2
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Showing 12 changed files with 35 additions and 5 deletions.
diff --git a/packages/checks/src/exists-not-null.ts b/packages/checks/src/exists-not-null.ts
@@ -1,3 +1,3 @@
 export function existsAndNotNull(x: any) {
-    return !(x === undefined || x === null);
+    return x != null;
 }
diff --git a/packages/checks/src/has-max-length.ts b/packages/checks/src/has-max-length.ts
@@ -0,0 +1,3 @@
+export function hasMaxLength(len: number, x: ArrayLike<any>) {
+    return x != null && x.length <= len;
+}
diff --git a/packages/checks/src/has-min-length.ts b/packages/checks/src/has-min-length.ts
@@ -0,0 +1,3 @@
+export function hasMinLength(len: number, x: ArrayLike<any>) {
+    return x != null && x.length >= len;
+}
diff --git a/packages/checks/src/index.ts b/packages/checks/src/index.ts
@@ -1,18 +1,24 @@
 export * from "./exists-not-null";
 export * from "./exists";
 export * from "./has-crypto";
+export * from "./has-max-length";
+export * from "./has-min-length";
 export * from "./has-wasm";
 export * from "./has-webgl";
 export * from "./has-websocket";
 export * from "./implements-function";
 export * from "./is-array";
 export * from "./is-arraylike";
+export * from "./is-blob";
 export * from "./is-boolean";
 export * from "./is-chrome";
+export * from "./is-even";
 export * from "./is-false";
+export * from "./is-file";
 export * from "./is-firefox";
 export * from "./is-function";
 export * from "./is-ie";
+export * from "./is-in-range";
 export * from "./is-int32";
 export * from "./is-iterable";
 export * from "./is-mobile";
@@ -21,8 +27,10 @@ export * from "./is-node";
 export * from "./is-null";
 export * from "./is-number";
 export * from "./is-object";
+export * from "./is-odd";
 export * from "./is-plain-object";
 export * from "./is-positive";
+export * from "./is-regexp";
 export * from "./is-safari";
 export * from "./is-string";
 export * from "./is-symbol";

diff --git a/packages/checks/src/is-array.ts b/packages/checks/src/is-array.ts
@@ -1,3 +1 @@
-export function isArray(x: any): x is Array<any> {
-    return x != null && x.constructor === Array;
-}
+export const isArray = Array.isArray;
diff --git a/packages/checks/src/is-arraylike.ts b/packages/checks/src/is-arraylike.ts
@@ -1,3 +1,3 @@
 export function isArrayLike(x: any): x is ArrayLike<any> {
-    return x != null && (x.constructor === Array || x.length !== undefined);
+    return Array.isArray(x) || (x != null && x.length !== undefined);
 }
diff --git a/packages/checks/src/is-blob.ts b/packages/checks/src/is-blob.ts
@@ -0,0 +1,3 @@
+export function isBlob(x: any): x is Blob {
+    return x instanceof Blob;
+}
diff --git a/packages/checks/src/is-even.ts b/packages/checks/src/is-even.ts
@@ -0,0 +1,3 @@
+export function isEven(x: number) {
+    return (x % 2) === 0;
+}
diff --git a/packages/checks/src/is-file.ts b/packages/checks/src/is-file.ts
@@ -0,0 +1,3 @@
+export function isFile(x: any): x is File {
+    return x instanceof File;
+}
diff --git a/packages/checks/src/is-in-range.ts b/packages/checks/src/is-in-range.ts
@@ -0,0 +1,3 @@
+export function isInRange(min: number, max: number, x: number) {
+    return x >= min && x <= max;
+}
diff --git a/packages/checks/src/is-odd.ts b/packages/checks/src/is-odd.ts
@@ -0,0 +1,3 @@
+export function isOdd(x: number) {
+    return (x % 2) === 1;
+}
diff --git a/packages/checks/src/is-regexp.ts b/packages/checks/src/is-regexp.ts
@@ -0,0 +1,3 @@
+export function isRegExp(x: any): x is RegExp {
+    return x instanceof RegExp;
+}