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This article mainly explains "what are the new array methods of JavaScript es6". The explanation in this article is simple and clear, easy to learn and understand. Please follow the ideas of Xiaobian and go deeper to study and learn "what are the new array methods of JavaScript es6" together!

1. forEach()

Traversing an array, no return Even if there is a return, it does not return any value and affects the original array.

Parameters of callback

value --the value of the current index

index --index

arr --original array

let arr = ["a", "b", "c", 1, 2, 3]; arr.forEach((value, index, arr) => { console.log(value, index, arr); })

Output:

2. arr.filter()

Filter the array and return an array that meets the requirements

Parameters of callback:

value --the value of the current index

index --index

let arr = [1,2,3,4,5]let arr1 = arr.filter( (value, index) => value%2 === 0)console.log(arr1) // [2, 4]3. arr.every()

According to the judgment condition, whether all elements of the array are satisfied, if satisfied, return true

Parameters of callback:

value --the value of the current index

index --index

let arr = [1,2,3,4,5]let arr1 = arr.every( (value, index) =>valuevalue{ value = value * 2 console.log(`value:${value} index:${index} array:${array}`)}) console.log(arr)

Results:

var arr1 = [1,2,3,4]; var res1 = arr1.map((item,index,arr)=>{ item = item * 3; return item; })console.log(arr1); // [1,2,3,4]console.log(res1); // [3,6,9,12]5. arr.some()

According to the judgment condition, whether one of the elements of the array is satisfied, and if one is satisfied, return true.

Parameters of callback:

value --the value of the current index

index --index

let arr = [1,2,3,4,5]let arr1 = arr.some( (value, index) => value

value > 6) console.log (arr2) // false Thank you for reading, the above is "JavaScript es6 new array methods what" content, after learning this article, I believe we have a deeper understanding of JavaScript es6 new array methods what this problem, the specific use of the situation also needs to be verified. Here is, Xiaobian will push more articles related to knowledge points for everyone, welcome to pay attention!

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