如何从JavaScript中的数组中删除某些数字元素

Question

var numbers = [1,2,0,3,0,4,0,5];

If I have the above array and I want to remove the 0s and output an array of [1,2,3,4,5] how would I do it?

I have the below code but I am getting an "TypeError: arr.includes is not a function" error...

var zero = 0;

var x = balDiffs.map(function(arr, i) {
  console.log(arr);
  if(arr.includes(zero)) {
    return i;
  }
});

Answer 1

Use Array#filter with Boolean function as the callback. The Boolean function will return false for 0, and true for other numbers:

 var numbers = [1,2,0,3,0,4,0,5]; var result = numbers.filter(Boolean); console.log(result); 

Answer 2

Array#map returns an array with the same length as the given array, but it can change the values of each element.

Then you took an element for Array#includes or String#includes but that does not work with numbers.

But even if that works, you would get only zeroes and undefined with the given approach.

---

You could use Array#filter and filter the unwanted value.

 var numbers = [1, 2, 0, 3, 0, 4, 0, 5], value = 0, // or any other value filtered = numbers.filter(v => v !== value); console.log(filtered); 

Approach with more than one unwanted value.

 var numbers = [1, 2, 0, 3, 0, 4, 0, 5], unwanted = [0, 3], filtered = numbers.filter(v => !unwanted.includes(v)); console.log(filtered);