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Find the index of a prime number in an array The following example finds the index of an element in the array that is a prime number (or returns -1 if there is no prime number).
Array.prototype.findIndex() – find and return an index Array.prototype.includes() – test whether a value exists in the array Array.prototype.filter() – find all matching elements
The findIndex() method executes the function once for each element present in the array: If it finds an array element where the function returns a true value, findIndex() returns the index of that array element (and does not check the remaining values)
The indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present. 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 not be searched. If the provided ...
how can I search for an item in this array according to the first entry in each item (r1,r2,..) the array is huge I am looking for a fast an effective way to get results from this array I used the JQuery function jQuery.inArray but it couldn't find any thing in my array , I used it this way :
The lastIndexOf() method searches the array for the specified item, and returns its position. The search will start at the specified position, or at the end if no start position is specified, and end the search at the beginning of the array.
Finding Array Elements with Array#indexOf - A Drip of ...
The indexOf method will return the index of the first element which matches your search. Or if it does not find a match it will return -1.. It also gives you the ability to start your search at an index other than 0.This can help speed things up if you already know you can rule out some portion at the beginning of the array.
Specification Status Comment; ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Array.prototype.find' in that specification. Standard: Initial definition.
jQuery.inArray() | jQuery API Documentation