Java List Find Index By Value, Hướng Dẫn Về Các Chữ Mẫu Javascript

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Definition & Usage

The substring() method extracts the characters from a string, between two specified indices, và returns the new sub string.

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This method extracts the characters in a string between "start" & "end", not including "end" itself.

If either "start" or "end" is less than 0, it is treated as if it were 0.

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Note: The substring() method does not change the original string.

Browser Support

Method substring() Yes Yes Yes Yes Yes

Syntax

string.substring(start, end)

Parameter Values

Parameter description start Required. The position where lớn start the extraction. First character is at index 0 end Optional. The position (up to, but not including) where to end the extraction. If omitted, it extracts the rest of the string

Technical Details

Return Value: A new String containing the extracted characters JavaScript Version: ECMAScript 1

More Examples

Example

Begin the extraction at position 2, & extract the rest of the string:

var str = "Hello world!"; var res = str.substring(2); Try it Yourself »

Example

If "start" is greater than "end", it will swap the two arguments:

var str = "Hello world!";var res = str.substring(4, 1); Try it Yourself »

Example

If "start" is less than 0, it will start extraction from index position 0:

var str = "Hello world!"; var res = str.substring(-3); Try it Yourself »

Example

Extract only the first character:

var str = "Hello world!"; var res = str.substring(0, 1); Try it Yourself »

Example

Extract only the last character:

var str = "Hello world!"; var res = str.substring(str.length - 1, str.length); Try it Yourself » ❮ Previous JavaScript String Reference Next ❯ màu sắc PICKER