However, the parameters for substr are the start character position and the numbers of characters to be extracted, respectively. Many JavaScript environments (including most modern web browsers) also implement a variant of substring called substr ( Section B.2.3). An example of substring is illustrated in this code snippet: var a = 'The Three Musketeers' In case the end value is smaller than the start, substring is smart enough to swap the values before doing the string extraction. This substring function can accept two numbers, the start and the end (exclusive) character position, respectively. String’s substring (ECMAScript 5.1 Specification Section 15.5.4.15) is the first logical choice to retrieve a part of the string.
Even worse, sometimes it is easy to fall into the trap and choose the wrong function. Because of this, often it is very confusing for beginners as to which function should be used. With JavaScript, there are three different built-in functions which can perform that operation. Ariya.io About Talks Articles JavaScript String: substring, substr, sliceĮxtracting a portion of a string is a fairly well understood practice.
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