17 I like Pablo's answer, but Array#indexOf and Array#map don't work on all browsers. Underscore will use native code if it's available, but has fallbacks as well. Plus it has the pluck …

Dec 9, 2008 · If your situation requires the use of a regular expression, use the search() method, otherwise; the indexOf() method is more performant.

Jan 3, 2017 · I am confused between the difference between the two function indexOf and find Index in an array. The documentation says findIndex - Returns the index of the first element in …

Dec 21, 2011 · I am learning Javascript and don't understand why the indexOf below returns -1: var string = "The quick brown fox jumps over the lazy dog"; console.log (string.indexOf("good"));

Dec 20, 2017 · 1 indexOf returns a -1 if the search is not in the string. This is because indexOf will return the position of the search term in the string. For example > -1 is another way of saying …

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Feb 10, 2011 · 22 Unlike in C# where you have the Array.IndexOf method, and JavaScript where you have the indexOf method, Java's API (the Array and Arrays classes in particular) have no …

Nov 27, 2019 · indexOf "inside if" is irrelevant. Only the results of such (and the incorrect expectation of usages are); replacing with the actual value would have the same effect. So …

In javascript, is there an equivalent of String.indexOf (...) that takes a regular expression instead of a string for the first parameter, while still allowing a second parameter ? I need to do some...

2 You can use the fromIndex of Array#indexOf. fromIndex The index to start the search at. If the index is greater than or equal to the array's length, -1 is returned, which means the array will …