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The join() method creates and returns a new string by concatenating all of the elements in an array (or an array-like object), separated by commas or a specified separator string. If the array has only one item, then that item will be returned without using the separator.
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The source for this interactive example is stored in a GitHub repository. If you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request.
Syntax
Parameters
separatorOptional- Specifies a string to separate each pair of adjacent elements of the array. The separator is converted to a string if necessary. If omitted, the array elements are separated with a comma (','). If
separatoris an empty string, all elements are joined without any characters in between them.
Return value
A string with all array elements joined. If arr.length is 0, the empty string is returned.
Description
The string conversions of all array elements are joined into one string.
If an element is undefined, null or an empty array [], it is converted to an empty string. Easycap usb 2.0 driver download mac.
Examples
Joining an array four different ways
The following example creates an array, a, with three elements, then joins the array four times: using the default separator, then a comma and a space, then a plus and an empty string.
Joining an array-like object
The following example joins array-like object (arguments), by calling Function.prototype.call on Array.prototype.join.
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Specifications
| Specification |
|---|
| ECMAScript (ECMA-262) The definition of 'Array.prototype.join' in that specification. |
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Browser compatibility
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See also