ES5 in array new API interface ForEach map filter Some every indexOf lastIndexOf reduce reduceright

var array = [23,48,66,2];

 ForEach: Loops, iterates through an array, no return value. Similar to For Loop 
Array.foreach (function (value, index, array) {  console.log (value);  return value *  value;});

 Map : The map means that the map returns a new array with a return value; Filterarr: Returns a new object 
var Maparr = Array.map (function (value, index, array) {return value *  value;});

 Filter : The meaning of filtering, filtering, return value; Filterarr: Returns the newly filtered array 
var Filterarr = Array.filter (function (value, index, array) {  if (value >) {    return true;  }  return false;});

 Everyarr: Every one, every meaning; return value; every: Returns Boolean true or false; 
var Everyarr = array.every (function (value, index, array) {  if (value > 1) {    return true;  }});

 IndexOf: The first one is the retrieved value, the second is the location to retrieve it from 0 onwards 
Console.log (Array.indexof (23,0));

 LastIndexOf: The first is the retrieved value, the second is the location to be retrieved from Arr.length-1 
Console.log (Array.lastindexof (2,10));

//Initial setupprevious = InitialValue = 1, current = 2 

//First Iteration previous = (1 + 2) =  3, current = 3  

//Second Iteration Previous = (3 + 3) =  6, current = 4  

//Third Iteration  Previous = (6 + 4) =  Ten, current = undefined (exit)
var reduce = [1,2,3,4].reduce (function (prev, Curr, index, array) {  Console.log (prev + "  + Curr);  return prev + Curr;});

//Initial setup index = 3, previous = InitialValue = 4, current = 3  

//First Iteration index = 2, previous = (4-3) = 1, current = 2  

//Second Iteration index = 1, previous = (1-2) =-1, current = 1  

//Third Iteration  index = 0, previous = ( -1 + 1) = 0, current = undefined (exit)
var reduceright = [1,2,3,4].reduceright (function (prev, Curr, index, array) {  if (index = = 0) {    return prev + cur R;  }  return prev-curr;});

Console.log (Reduceright);

ES5 in array new API interface ForEach map filter Some every indexOf lastIndexOf reduce reduceright