使用for循环拼接数组的正确方法是什么，嵌套了if条件

Question

i am facing this issue of splicing an array.i checked out all the examples i could find but all in vein. the troubles are these nested if conditions inside the for loop.i am doing i-- but not able to go ahead. can anybody help me out and explain the approach.i am adding a snippet. the prob is that, whenever i don't do the i-- operation, and splice the array, alternate removal of elements happens but upon adding the i--, i am not able to proceed any further. i tried --i, but now i am confused as to what i am doing wrong. here m is an array of number from 1 to 20 serially. having length 20.

        var k=13;
        for (var i = 0; i < m.length; i++) {
            if (m[i] < k) {
                if (i != 0 && i != m.length) {
                    m.splice(i, 1);
                }
                if (i == 0) {
                    m.splice(i, 1);
                }
                i--;
            }
        }

Answer 1

From what I can read, you want to filter out all elements lesser than 13. You can do the same by using filter() in javascript

const filterLimit = 13;

// Here filteredList is the list of all elements lesser than filterLimit
const filteredList = m.filter(item => item >= filterLimit);

Example:

 const filterLimit = 13; const unFilteredList = [1, 13, 14, 2, 5, 33]; const filteredList = unFilteredList.filter(item => item >= filterLimit); console.log(filteredList);

Answer 2

There is an error in this approach and that's you must not change the parameter (i) of the loop inside the loop

You can use while instead:

var k=13;
var i=0;
while (i < m.length){
    if(m[i] < k){
        m.splice(i, 1);
    }else{
        i++;
    }
}