❮PreviousJavaScript ArrayReferenceNext❯ Example 1 Check if any values are over 18: constages = [3,10,18,20]; ages.some(checkAdult); functioncheckAdult(age) { returnage >18; } Try it Yourself » Description Thesome()method checks if any array elements pass a test (provided as a...
The some() method checks if any of the elements in an array pass a test (provided as a function).The some() 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, some() returns true (and does ...
Throughout the examples in this tutorial, we will use the arrow function syntax. To read and understand more about functions in JavaScript, read theFunctions reference on the Mozilla Developer Network. forEach() TheforEach()method calls a function for each element in an array. Let’s star...
In the above example, we have used thesome()method to find out if any of the students have scored marks less than40. We have passedcallbackin the method asscoreObtained.some(studentIsPassed)which returns true becausescoreObtainedcontains at least one element i.e.20which is less than40. Si...
in operator//b. Let kPresent be the result of calling the HasProperty internal//method of O with argument Pk.//This step can be combined with c//c. If kPresent is true, thenif(kinO) {//i. Let kValue be the result of calling the Get internal//method of O with argument Pk.k...
To learn more, visit JavaScript Array splice(). Array Methods JavaScript has various array methods to perform useful operations. Some commonly used array methods in JavaScript are: MethodDescription concat() Joins two or more arrays and returns a result. toString() Converts an array to a string...
❮PreviousJavaScript ArrayReferenceNext❯ Examples Return a new array with the square root of all element values: constnumbers = [4,9,16,25]; constnewArr = numbers.map(Math.sqrt) Try it Yourself » Multiply all the values in an array with 10: ...
slice()method is used for slicing, that is, intercepting some of the elements in the array, and then returning a new array, leaving the original array unchanged. slice()method can receive one or two parameters: the start index and end index of the returned element.slice()includes the start...
for(let a in arr) { console.log(a+':'+arr[a]) }//0:3 1:4 2:4 3:5 filter() 一个过滤方法,参数是一个函数,所有的数组成员依次执行该函数,返回结果为true的成员组成一个新数组返回。(不会改变原始数组)。 const arr8 = [3,4,4,5,4,6,5,7]; ...
JavaScript Array.fill() Method Using the fill() operation, we can replace certain elements with some static values. This method is an in-place method, meaning that it modifies the original array. It does not return a new array. Syntax: ...