From 95aca4b4d8fa62815d4bd412fff1a364f842814a Mon Sep 17 00:00:00 2001 From: Ryan Johnson Date: Thu, 29 Apr 2021 16:16:42 -0700 Subject: remove retired locales (#699) --- .../reference/statements/for...of/index.html | 269 --------------------- 1 file changed, 269 deletions(-) delete mode 100644 files/he/web/javascript/reference/statements/for...of/index.html (limited to 'files/he/web/javascript/reference/statements/for...of/index.html') diff --git a/files/he/web/javascript/reference/statements/for...of/index.html b/files/he/web/javascript/reference/statements/for...of/index.html deleted file mode 100644 index 86edb2f69e..0000000000 --- a/files/he/web/javascript/reference/statements/for...of/index.html +++ /dev/null @@ -1,269 +0,0 @@ ---- -title: for...of -slug: Web/JavaScript/Reference/Statements/for...of -translation_of: Web/JavaScript/Reference/Statements/for...of ---- -
{{jsSidebar("Statements")}}
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הצהרת for...of יוצרת לולאה ע"ג iterable objects (שכולל {{jsxref("Array")}}, {{jsxref("Map")}}, {{jsxref("Set")}}, {{jsxref("String")}}, {{jsxref("TypedArray")}}, arguments object וכן הלאה..),
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invoking a custom iteration hook with statements to be executed for the value of each distinct property.
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Syntax

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for (variable of iterable) {
-  statement
-}
-
- -
-
variable
-
בכל איטרציה, ערך ה property הנוכחי של iterable מוקצה ל variable
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iterable
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אובייקט עם properties ברי איטרציה
-
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לדוגמא:

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איטרציה ע"ג {{jsxref("Array")}}

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let iterable = [10, 20, 30];
-
-for (let value of iterable) {
-  console.log(value);
-}
-// 10
-// 20
-// 30
-
- -

אפשר להשתמש ג"כ ב const במקום let באם אתה לא משנה את ערך המשתנה בתוך הבלוק.

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איטרציה ע"ג {{jsxref("String")}}

- -
let iterable = "boo";
-
-for (let value of iterable) {
-  console.log(value);
-}
-// "b"
-// "o"
-// "o"
-
- -

Iterating over a {{jsxref("TypedArray")}}

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let iterable = new Uint8Array([0x00, 0xff]);
-
-for (let value of iterable) {
-  console.log(value);
-}
-// 0
-// 255
-
- -

Iterating over a {{jsxref("Map")}}

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let iterable = new Map([["a", 1], ["b", 2], ["c", 3]]);
-
-for (let entry of iterable) {
-  console.log(entry);
-}
-// [a, 1]
-// [b, 2]
-// [c, 3]
-
-for (let [key, value] of iterable) {
-  console.log(value);
-}
-// 1
-// 2
-// 3
-
- -

Iterating over a {{jsxref("Set")}}

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let iterable = new Set([1, 1, 2, 2, 3, 3]);
-
-for (let value of iterable) {
-  console.log(value);
-}
-// 1
-// 2
-// 3
-
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Iterating over a DOM collection

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Iterating over DOM collections like {{domxref("NodeList")}}: the following example adds a read class to paragraphs that are direct descendants of an article:

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// Note: This will only work in platforms that have
-// implemented NodeList.prototype[Symbol.iterator]
-let articleParagraphs = document.querySelectorAll("article > p");
-
-for (let paragraph of articleParagraphs) {
-  paragraph.classList.add("read");
-}
-
- -

Iterating over generators

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You can also iterate over generators:

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function* fibonacci() { // a generator function
-  let [prev, curr] = [1, 1];
-  while (true) {
-    [prev, curr] = [curr, prev + curr];
-    yield curr;
-  }
-}
-
-for (let n of fibonacci()) {
-  console.log(n);
-  // truncate the sequence at 1000
-  if (n >= 1000) {
-    break;
-  }
-}
-
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Iterating over other iterable objects

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You can also iterate over an object that explicitly implements iterable protocol:

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var iterable = {
-  [Symbol.iterator]() {
-    return {
-      i: 0,
-      next() {
-        if (this.i < 3) {
-          return { value: this.i++, done: false };
-        }
-        return { value: undefined, done: true };
-      }
-    };
-  }
-};
-
-for (var value of iterable) {
-  console.log(value);
-}
-// 0
-// 1
-// 2
-
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Difference between for...of and for...in

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The for...in loop will iterate over all enumerable properties of an object.

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The for...of syntax is specific to collections, rather than all objects. It will iterate in this manner over the elements of any collection that has a [Symbol.iterator] property.

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The following example shows the difference between a for...of loop and a for...in loop.

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Object.prototype.objCustom = function () {};
-Array.prototype.arrCustom = function () {};
-
-let iterable = [3, 5, 7];
-iterable.foo = "hello";
-
-for (let i in iterable) {
-  console.log(i); // logs 0, 1, 2, "foo", "arrCustom", "objCustom"
-}
-
-for (let i of iterable) {
-  console.log(i); // logs 3, 5, 7
-}
-
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Specifications

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SpecificationStatusComment
{{SpecName('ES6', '#sec-for-in-and-for-of-statements', 'for...of statement')}}{{Spec2('ES6')}}Initial definition.
{{SpecName('ESDraft', '#sec-for-in-and-for-of-statements', 'for...of statement')}}{{Spec2('ESDraft')}} 
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Browser compatibility

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{{CompatibilityTable}}

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FeatureChromeFirefox (Gecko)EdgeOperaSafari
Basic support{{CompatChrome(38)}} [1]
- {{CompatChrome(51)}} [3]		{{CompatGeckoDesktop("13")}} [2]12257.1
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FeatureAndroidChrome for AndroidFirefox Mobile (Gecko)IE MobileOpera MobileSafari Mobile
Basic support5.1{{CompatChrome(38)}} [1]{{CompatGeckoMobile("13")}} [2]{{CompatNo}}{{CompatUnknown}}8
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[1] From Chrome 29 to Chrome 37 this feature was available behind a preference. In chrome://flags/#enable-javascript-harmony, activate the entry “Enable Experimental JavaScript”.

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[2] Prior Firefox 51, using the for...of loop construct with the const keyword threw a {{jsxref("SyntaxError")}} ("missing = in const declaration"). This has been fixed ({{bug(1101653)}}).

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[3] Support for iteration of objects was added in Chrome 51.

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See also

- - -- cgit v1.2.3-54-g00ecf