The lastIndexOf() method does not change the value of the original string.Example Let's take a look at an example of how to use the lastIndexOf() method in JavaScript. For example: var totn_string = 'TechOnTheNet'; console.log(totn_string.lastIndexOf('T')); In this example, we...
JavaScript Array lastIndexOf Method if (!Array.prototype.lastIndexOf) { Array.prototype.lastIndexOf = function(elt /*, from*/) { var len = this.length; var from = Number(arguments[1]); if (isNaN(from)) { from = len - 1; } else { from = (from < 0) ? Math.ceil(fro...
varname=['gfg','cse','geeks','portal']; // lastIndexOf() method is called to // test whether the searching element // is present in given array or not. a=name.lastIndexOf('cat') // Printing result of method document.write(a); 输出: -1 支持的浏览器:JavaScript Array lastIndex...
The lastIndexOf() method in the above program returns -1, when the substring is not found.Original string: JavaScript Sub-string to be searched: Mom Method str.lastIndexOf(sub_str) returns: -1 Not found...! Example 4Let's see the difference between the indexOf() and lastIndexOf() ...
ThelastIndexOf()method returns the last index (position) of a specified value. ThelastIndexOf()method returns -1 if the value is not found. ThelastIndexOf()starts at a specified index and searches from right to left (from the given postion to the beginning of the array). ...
JavaScript Array lastIndexOf Method if (!Array.prototype.lastIndexOf) { Array.prototype.lastIndexOf=function(elt /*, from*/) { var len=this.length; var from=Number(arguments[1]); if (isNaN(from)) { from=len - 1; } else { from=(from ...
JavaScript Array lastIndexOf Method - Learn how to use the lastIndexOf method in JavaScript to find the last occurrence of an element in an array. Detailed examples and explanations.
TheArray.lastIndexOf()method returns the last index position of a specified value. If the searched value is not found in the array, it will return-1. Example 1: UseArray.lastIndexOf()Method With Required ParametertargetValue arr1=[5,3,6,5,9]arr2=['Eel','Whale','Eel','Dolphin','...
ThelastIndexOf()method returns the index (position) of the last occurrence of a specified value in a string. ThelastIndexOf()method searches the string from the end to the beginning. ThelastIndexOf()method returns the index from the beginning (position 0). ...
if (from in this && this[from] === elt) return from; } return -1; }; } 例子(Example) 请尝试以下示例。 JavaScript Array lastIndexOf Method if (!Array.prototype.lastIndexOf) { Array.prototype.lastIndexOf = function(elt /*, from*/) { var len = ...