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The substring() method extracts characters from start to end (exclusive). The substring() method does not change the original string. If start is greater than end, arguments are swapped: (4, 1) = (1, 4). Start or end values less than 0, are treated as 0.
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JavaScript String substring() substring() is similar to...
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4 cze 2024 · substring() extracts characters from indexStart up to but not including indexEnd. In particular: If indexEnd is omitted, substring() extracts characters to the end of the string. If indexStart is equal to indexEnd, substring() returns an empty string.
24 lis 2009 · In ECMAScript 5 or older environments, use String.prototype.indexOf, which returns -1 when a substring cannot be found: var string = "foo"; var substring = "oo"; console.log(string.indexOf(substring) !== -1); // true
12 wrz 2023 · A string's substr() method extracts length characters from the string, counting from the start index. If start >= str.length , an empty string is returned. If start < 0 , the index starts counting from the end of the string.
The following example uses the substring() to extract a substring from the index 11 to the end of the string: let str = 'JavaScript Substring' ; let substring = str.substring( 11 ); console .log(substring); Code language: JavaScript ( javascript )
JavaScript String substring() substring() is similar to slice(). The difference is that start and end values less than 0 are treated as 0 in substring().
27 cze 2017 · The substring() method returns a subset of a string between one index and another, or through the end of the string. Syntax str .substring( indexStart [, indexEnd ])
