This is the answer I was looking for as it was unclear to me if IndexOf matched by value or what. Now I know I can use IndexOf to find my object, and not worry if there are other objects with …

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 · The use of -1 is because the indexOf operation will return -1 in the event the searched for value does not exist in the array. As for why they use != -1 in one place and > -1 …

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

Nov 11, 2017 · 107 We are given a string, say, "itiswhatitis" and a substring, say, "is". I need to find the index of 'i' when the string "is" occurs a second time in the original string. …

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 …

You need add href property and check indexOf instead of contains

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 …

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...

Dec 27, 2013 · The .indexOf() method has an optional second parameter that specifies the index to start searching from, so you can call it in a loop to find all instances of a particular value: …