add some, every, find

tc39 · May 24, 2019 · dabd9cd · dabd9cd
1 parent c99ca9c
commit dabd9cd
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Showing 2 changed files with 86 additions and 6 deletions.
diff --git a/polyfill.js b/polyfill.js
@@ -501,15 +501,58 @@ Iterator.syncPrototype.collect = function collect() {
 
 Iterator.syncPrototype.forEach = function forEach(fn) {
   const iterated = GetIteratorDirect(this);
-  let index = 0;
   while (true) {
     const next = ES.IteratorStep(iterated);
     if (next === false) {
       return undefined;
     }
     const value = ES.IteratorValue(next);
-    ES.Call(fn, undefined, [value, index]);
-    index += 1;
+    ES.Call(fn, undefined, [value]);
+  }
+};
+
+Iterator.syncPrototype.some = function some(fn) {
+  const iterated = GetIteratorDirect(this);
+  while (true) {
+    const next = ES.IteratorStep(iterated);
+    if (next === false) {
+      return false;
+    }
+    const value = ES.IteratorValue(next);
+    const result = ES.ToBoolean(ES.Call(fn, undefined, [value]));
+    if (result === true) {
+      return true;
+    }
+  }
+};
+
+Iterator.syncPrototype.every = function every(fn) {
+  const iterated = GetIteratorDirect(this);
+  while (true) {
+    const next = ES.IteratorStep(iterated);
+    if (next === false) {
+      return true;
+    }
+    const value = ES.IteratorValue(next);
+    const result = ES.ToBoolean(ES.Call(fn, undefined, [value]));
+    if (result === false) {
+      return false;
+    }
+  }
+};
+
+Iterator.syncPrototype.find = function find(fn) {
+  const iterated = GetIteratorDirect(this);
+  while (true) {
+    const next = ES.IteratorStep(iterated);
+    if (next === false) {
+      return undefined;
+    }
+    const value = ES.IteratorValue(next);
+    const result = ES.ToBoolean(ES.Call(fn, undefined, [value]));
+    if (result === true) {
+      return value;
+    }
   }
 };
 

diff --git a/spec.html b/spec.html
@@ -539,13 +539,50 @@ <h1>%IteratorPrototype%.collect ( )</h1>
         <h1>%IteratorPrototype%.forEach ( _fn_ )</h1>
         <emu-alg>
           1. Let _iterated_ be ? GetIteratorDirect(*this* value).
-          1. Let _index_ be *0*.
           1. Repeat,
             1. Let _next_ be ? IteratorStep(_iterated_).
             1. If _next_ is *false*, return *undefined*.
             1. Let _value_ be ? IteratorValue(_next_).
-            1. Perform ? Call(_fn_, *undefined*, &laquo; _value_, _index_ &raquo;).
-            1. Set _index_ to _index_ + *1*.
+            1. Perform ? Call(_fn_, *undefined*, &laquo; _value_ &raquo;).
+        </emu-alg>
+      </emu-clause>
+
+      <emu-clause id="sec-iteratorprototype-some">
+        <h1>%IteratorPrototype%.some ( _fn_ )</h1>
+        <emu-alg>
+          1. Let _iterated_ be ? GetIteratorDirect(*this* value).
+          1. Repeat,
+            1. Let _next_ be ? IteratorStep(_iterated_).
+            1. If _next_ is *false*, return *false*.
+            1. Let _value_ be ? IteratorValue(_next_).
+            1. Let _result_ be ToBoolean(? Call(_fn_, *undefined*, &laquo; _value_ &raquo;)).
+            1. If _result_ is *true*, return *true*.
+        </emu-alg>
+      </emu-clause>
+
+      <emu-clause id="sec-iteratorprototype-every">
+        <h1>%IteratorPrototype%.every ( _fn_ )</h1>
+        <emu-alg>
+          1. Let _iterated_ be ? GetIteratorDirect(*this* value).
+          1. Repeat,
+            1. Let _next_ be ? IteratorStep(_iterated_).
+            1. If _next_ is *false*, return *true*.
+            1. Let _value_ be ? IteratorValue(_next_).
+            1. Let _result_ be ToBoolean(? Call(_fn_, *undefined*, &laquo; _value_ &raquo;)).
+            1. If _result_ is *false*, return *false*.
+        </emu-alg>
+      </emu-clause>
+
+      <emu-clause id="sec-iteratorprototype-find">
+        <h1>%IteratorPrototype%.find ( _fn_ )</h1>
+        <emu-alg>
+          1. Let _iterated_ be ? GetIteratorDirect(*this* value).
+          1. Repeat,
+            1. Let _next_ be ? IteratorStep(_iterated_).
+            1. If _next_ is *false*, return *undefined*.
+            1. Let _value_ be ? IteratorValue(_next_).
+            1. Let _result_ be ToBoolean(? Call(_fn_, *undefined*, &laquo; _value_ &raquo;)).
+            1. If _result_ is *true*, return _value_.
         </emu-alg>
       </emu-clause>
     </emu-clause>