Theincludes()method is case sensitive. Syntax array.includes(element,start) Parameters ParameterDescription elementRequired. The value to search for. startOptional. Start position. Default is 0. Return Value Typ
In the above example, we have passed two argument values in theinclude()method. languages.includes("Java", 2)returnsfalsesince the method doesn't find'Java'fromsecondindex of the array. Inlanguages.includes("Java", -3), the method starts searching'Java'from thethird lastelement because of ...
Return a new array: Other array methods, such as Concat, Slice, and Map, return a new array without modifying the original array. Accept arguments: Many array methods accept arguments that allow you to customize their behaviour. For example, the.slice() method accepts start and end indices a...
// lastIndexOf() method function isGreaterThan5(element, index, array) { return element > 5; } function func() { // Original array var array = [2, 5, 8, 1, 4]; // Checking for condition in array var value = array.some(isGreaterThan5); document.write(value); } func(); 1...
//Original arrayvar arr = [ [11, 89], [23, 7], 98 ]; // Performing flat methodvar geeks = arr.flat(); document.write(geeks) 输出: 11,89,23,7,98 6、flatMap()方法 此方法用于将输入数组元素展平为新数组。此方法首...
if(value instanceOf Array){} if(Array.isArray(value)){} 2.转换方法 toLocalString() 把数组转换为本地数组,并返回结果。 toString() 把数组转换为字符串,并返回结果。 valueOf() 返回数组对象的原始值。 join() 把数组的所有元素放入一个字符串。元素通过指定的分隔符进行分隔。
For strings, theincludes()method has the following syntax: string.includes(substring,startPosition); For arrays, theincludes()method has the following syntax: array.includes(element,fromIndex); Parameters substring(for strings) /element(for arrays): The value that you want to search for within the...
The map() method creates a new array with the results of calling a function for every array element.The map() method calls the provided function once for each element in an array, in order.Note: map() does not execute the function for array elements without values....
TheArray.from()method returns an array from any iterable object. Array.from() Array.from() is a static property of the JavaScript Array object. You can only use it as Array.from(). Using x.from(), where x is an array will return undefined. ...
Array.of(element0, element1, ..., elementN) Theof()method, being a static method, is called using theArrayclass name. of() Parameters Theof()method can takennumber of parameters: nspecifies the number of elements inside the new array. ...