How to remove item from array

How to remove current item from array in this case ?

  for al in al1
    if al.y<100 then al.REMOVE? end
  end

read the documentation:https://microstudio.dev/documentation/microScript-cheatsheet/ list.removeAt( index ): Removes from the list the element at position index list.removeElement( element ): Removes from the list element, if it can be found in the list

it found, but nothing removed, uses both of it functions:

init = function()
  z=["231","31e","qwe1"]
  for i in z
    // print (i)
    if i=="31e" then 
      print("Delete: "+i) 
      z.removeAt[i] 
      z.removeElement[i]  
    end
  end
  for i in z
    print (i)
  end

  
end

update = function()
end

draw = function()
end

result is:

microScript 2.0
Delete: 31e
231
31e
qwe1

// Method 1
z=["231","31e","qwe1"]
z.removeElement("31e")
print(z)

// Method 2
z=["231","31e","qwe1"]
for i=0 to z.length-1
  if z[i]=="31e" then z.removeAt(i) end
end
print(z)

// Method 3
z=["231","31e","qwe1"]
pos=z.indexOf("31e")
if pos>=0 then z.removeAt(pos) end
print(z)
end

but if

z=[
 object x=1 y=2 end,
 object x=2 y=3 end,
 object x=3 y=1 end
]

Example in how to remove an object, where y==300

z=[
 object x=1 y=200 end,
 object x=2 y=300 end,
 object x=3 y=100 end
]

for obj in z
    if obj.y==300 then z.removeElement(obj) end
end
for obj in z
  print(obj.x+","+obj.y)
end