javascript - what browsers do not support native forEach, filter, every and so on - Stack Overflow

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After reading documentation of underscore.js I found (to my surprise) that actually not all browsers support

• forEach
• filter
• every
• some

methods. Previously I thought that these methods are implemented everywhere. Checking what browsers does not support them, did not give me any information: my chrome, IE9, firefox 13 all supports them.

So where can I find what browsers support them and may be what other methods are not supported everywhere?

P.S I am sorry, I think I confused someone with my question. I know that all browsers support underscore's foreach. In the question I refer to native methods.

After reading documentation of underscore.js I found (to my surprise) that actually not all browsers support

• forEach
• filter
• every
• some

methods. Previously I thought that these methods are implemented everywhere. Checking what browsers does not support them, did not give me any information: my chrome, IE9, firefox 13 all supports them.

So where can I find what browsers support them and may be what other methods are not supported everywhere?

P.S I am sorry, I think I confused someone with my question. I know that all browsers support underscore's foreach. In the question I refer to native methods.

• javascript
• browser
• underscore.js

Share Improve this question Follow edited Oct 13, 2015 at 5:40 user3335966 2,74544 gold badges3232 silver badges3333 bronze badges asked Nov 9, 2012 at 13:00 Salvador DaliSalvador Dali 223k151151 gold badges724724 silver badges765765 bronze badges 2

• possible duplicate of What's the current status of Javascript ES5? – Bergi Commented Nov 9, 2012 at 13:08
• Sure, the question are not the same (because you only asked for a part of ES5), but I wanted to link it for others – Bergi Commented Nov 9, 2012 at 13:28

Add a ment  | 

4 Answers 4

Sorted by: Reset to default 12

here is a nice patibility table: http://kangax.github./es5-pat-table/

I normally take a look at http://kangax.github./es5-pat-table/ which has a pretty good table off support for allot of javascript methods.

They ave been around for some time. JavaScriptKit is a good resource.

All modern browsers with JavaScript 1.6+ support implement these methods.

Javascriptkit: Arrays

All browsers will support underscore's methods forEach, filter, every and some (and any other methods). It is just that some of them will be not as efficient because they don't have native counterparts.

As an example, check forEach: underscore first checks if the Array prototype supports forEach natively with nativeForEach = ArrayProto.forEach. If it does, it uses the native prototype method. If not, it uses it's own implementation with a for loop (in collection functions, see var each = _.each = _.forEach = function(obj, iterator, context) ....

After reading documentation of underscore.js I found (to my surprise) that actually not all browsers support

• forEach
• filter
• every
• some

methods. Previously I thought that these methods are implemented everywhere. Checking what browsers does not support them, did not give me any information: my chrome, IE9, firefox 13 all supports them.

So where can I find what browsers support them and may be what other methods are not supported everywhere?

P.S I am sorry, I think I confused someone with my question. I know that all browsers support underscore's foreach. In the question I refer to native methods.

After reading documentation of underscore.js I found (to my surprise) that actually not all browsers support

• forEach
• filter
• every
• some

methods. Previously I thought that these methods are implemented everywhere. Checking what browsers does not support them, did not give me any information: my chrome, IE9, firefox 13 all supports them.

So where can I find what browsers support them and may be what other methods are not supported everywhere?

P.S I am sorry, I think I confused someone with my question. I know that all browsers support underscore's foreach. In the question I refer to native methods.

• javascript
• browser
• underscore.js

Share Improve this question Follow edited Oct 13, 2015 at 5:40 user3335966 2,74544 gold badges3232 silver badges3333 bronze badges asked Nov 9, 2012 at 13:00 Salvador DaliSalvador Dali 223k151151 gold badges724724 silver badges765765 bronze badges 2

• possible duplicate of What's the current status of Javascript ES5? – Bergi Commented Nov 9, 2012 at 13:08
• Sure, the question are not the same (because you only asked for a part of ES5), but I wanted to link it for others – Bergi Commented Nov 9, 2012 at 13:28

Add a ment  | 

4 Answers 4

Sorted by: Reset to default 12

here is a nice patibility table: http://kangax.github./es5-pat-table/

I normally take a look at http://kangax.github./es5-pat-table/ which has a pretty good table off support for allot of javascript methods.

They ave been around for some time. JavaScriptKit is a good resource.

All modern browsers with JavaScript 1.6+ support implement these methods.

Javascriptkit: Arrays

All browsers will support underscore's methods forEach, filter, every and some (and any other methods). It is just that some of them will be not as efficient because they don't have native counterparts.

As an example, check forEach: underscore first checks if the Array prototype supports forEach natively with nativeForEach = ArrayProto.forEach. If it does, it uses the native prototype method. If not, it uses it's own implementation with a for loop (in collection functions, see var each = _.each = _.forEach = function(obj, iterator, context) ....

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