Add ssv.blank method (#46)

Author: ryanve

README.md

@@ -23,6 +23,9 @@ ssv.any("mark tom travis", "matt") // false
 ssv.any("mark tom travis", "mark") // true
 ssv.any("mark tom travis", "mark scott") // true
 ssv.any("mark tom travis", "mark travis") // true
+ssv.blank("travis") // false
+ssv.blank("      ") // true
+ssv.blank("") // true
 ssv.count("  matt  mark  ") // 2
 ssv.count("matt matt matt") // 3
 ```
@@ -76,6 +79,11 @@ ssv.state({
 - Test if <var>SSV</var> contains **any** <var>SSV2</var> values
 - `@return` boolean
 
+### `ssv.blank(SSV)`
+- Test if <var>SSV</var> has no values
+- `true` for empty string or whitespace
+- `@return` boolean
+
 ### `ssv.compact(SSV)`
 - Normalize <var>SSV</var> string to a trim compact string
 - `@return` string

ssv.d.ts

@@ -1,6 +1,7 @@
 declare module ssv {
   export function all(ssv: string, search: string): boolean;
   export function any(ssv: string, search: string): boolean;
+  export function blank(ssv: string): boolean;
   export function compact(ssv: string): string;
   export function concat(ssv: string, more: string): string;
   export function count(ssv: string): number;

ssv.js

@@ -20,6 +20,10 @@
     return split(string).length
   }
 
+  function blank(string) {
+    return !string.match(word)
+  }
+
   function any(ssv, search) {
     search = split(search)
     var l = search.length
@@ -111,6 +115,7 @@
 
   api["all"] = all
   api["any"] = any
+  api["blank"] = blank
   api["compact"] = compact
   api["concat"] = concat
   api["count"] = count

test.js

@@ -50,6 +50,11 @@ assert.strictEqual(api.any("  mark   tom ", "matt travis"), false)
 assert.strictEqual(api.any("  mark   tom  mark", "travis tom"), true)
 console.log("#any tests passed")
 
+assert.strictEqual(api.blank("travis"), false)
+assert.strictEqual(api.blank("      "), true)
+assert.strictEqual(api.blank(""), true)
+console.log("#blank tests passed")
+
 assert.strictEqual(api.concat("", ""), "")
 assert.strictEqual(api.concat("", "mark"), "mark")
 assert.strictEqual(api.concat("mark tom", "travis"), "mark tom travis")