Five iteration methods and two merging methods for js arrays (recommended)
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= function(){
//every() is equivalent to logic and var arr = [1,2,3,4,5,6,7,8];
var everyRes = (function(item,index,array){
return (item>2);
});
alert(everyRes);
//some() is equivalent to logical or var someRes = (function(item,index,array){
return (item>2);
});
alert(someRes);
//filter() returns an array of given conditions var filterRes = (function(item,index,array){
return (item>2);
});
alert(filterRes);
//map() returns an array of given conditions var mapRes = (function(item,index,array){
return (item*2);
});
alert(mapRes);
//ForEach() has no return value. If you are interested, you can test it yourself. }
// reduce() merge method accepts the passed function and the initial value as the basis for merge (optional) //The function to be passed in receives four functions, the previous value, the current value, the index item, the array object var sum = (function(prev,cur,index,array){
return prev + cur;
});
alert(sum);
//ReduceRight() merge method is essentially the same as reduce() method, the difference is that it starts from the back to the front and inside. var sum2 = (function(pre,cur,index,array){
return pre + cur;
});
alert(sum2);
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