Crear cuenta
(1)
check_mathematical_expression("1+1") # true
check_mathematical_expression("1+1+1") # true
check_mathematical_expression("1+1-1*1/1") # true
check_mathematical_expression("10/2.5") # true
check_mathematical_expression("0.10/2.5*5") # true
check_mathematical_expression("") # false
check_mathematical_expression("1+2-a*2") # false
check_mathematical_expression("1+2 -2") # false
(2)
addBorder(["abc", "ded"]); // ["*****", "*abc*", "*ded*", "*****"]
addBorder(["a"]); // ["***", "*a*", "***"]
(7)list_flat([1, 2, 3]) # [1, 2, 3]
list_flat([[1], [], 2, [3,[4, 5, 6]], 7]) # [1, 2, 3, 4, 5, 6, 7]
list_flat([[[], []], []]) # []
list_flat([1, [[], []], []]) # [1]
list_flat([1, [["a"], [[[[["e"]]]]]], [["i"]]]) # [1, 'a', 'e', 'i']
joinLetters("") # []
joinLetters(".") # []
joinLetters("acdcaa") # ["aaa", "cc", "d"]
joinLetters("blue house!!") # ["b", "ee", "h", "l", "o", "s", "uu"]
joinLetters(""); // []
joinLetters("."); // []
joinLetters("acdcaa"); // ["aaa", "cc", "d"]
joinLetters("blue house!!"); // ["b", "ee", "h", "l", "o", "s", "uu"]