![]() ![]() The actual refactoring path depends on the knowledge of the range of a and l. For example, str.substr(a, l), str.slice(a, a + l), and str.substring(a, a + l) all have different results when str = "01234", a = 1, l = -2 - substr() returns an empty string, slice() returns "123", while substring() returns "0". The findIndex () method does not change the. The findIndex () method does not execute the function for empty array elements. The findIndex () method returns -1 if no match is found. The findIndex () method returns the index (position) of the first element that passes a test. For both start and length, NaN is treated as 0.Īlthough you are encouraged to avoid using substr(), there is no trivial way to migrate substr() to either slice() or substring() in legacy code without essentially writing a polyfill for substr(). The findIndex () method executes a function for each array element.If length If start = str.length, substr() extracts characters to the end of the string.If start >= str.length, an empty string is returned.()Ī string's substr() method extracts length characters from the string, counting from the start index.Object.prototype._lookupSetter_() Deprecated.Object.prototype._lookupGetter_() Deprecated.Object.prototype._defineSetter_() Deprecated.If either or both of the arguments are negative or NaN, the substring () method treats them as if they were 0. const text 'Mozilla' console.log(text.substring(5, 2)) // 'zil' console.log(text.slice(5, 2)) // ''. Object.prototype._defineGetter_() Deprecated The slice () method returns an empty string if this is the case. ![]()
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