How to find the average of an array in javascript

Method to find the average of an array in JavaScript: first obtain all parameters; then convert the obtained parameters into an array; then remove the first and last items in the array; finally convert the The remaining data can be summed and averaged.

The operating environment of this article: windows7 system, javascript version 1.8.5, Dell G3 computer.

How to find the average of an array in javascript?

js Several ways to find the average of an array

Ideas

• Get all the parameters

• Convert the obtained parameters into an array

• Remove the first and last items in the array

• Then add the remaining items in the array Sum the data and take the average value

function sumAverage() {
  let arr = []
  // console.log(arguments)
  //  for (let index = 0; index < arguments.length; index++) {
  //    arr.push(arguments[index]);
  // }
  arr=Array.from(arguments)
// arr=[...arguments]
  arr.pop()//pop从后面删除
  arr.shift()//shift从前面删除
  let sumTotal=0
 // for (let index = 0; index < arr.length; index++) {
 //      let item = arr[index]
 //      sumTotal += item     
 // }
 sumTotal = eval(arr.join(&#39;+&#39;))
  return sumTotal/arguments.length
}
let result = sumAverage(...[1, 6, 7, 8, 9, 9, 44, 1, 55, 1])//...展开数组
console.log(result)

Technical point:

arguments Get the indefinite number of parameters passed by the function

Place the arguments as an array Convert to array Array.from...structure loop

pop deletes the last item, shift deletes the first item

eval turns string concatenation into arithmetic operation

【 Recommended learning: javascript advanced tutorial】

The above is the detailed content of How to find the average of an array in javascript. For more information, please follow other related articles on the PHP Chinese website!