#177
Balancing Brackets
 

Difficulty:Medium
Topics:parsing


When parsing a snippet of code it's often a good idea to do a sanity check to see if all the brackets match up. Write a function that takes in a string and returns truthy if all square [ ] round ( ) and curly { } brackets are properly paired and legally nested, or returns falsey otherwise.
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(__ "This string has no brackets.")
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(__ "class Test {
      public static void main(String[] args) {
        System.out.println(\"Hello world.\");
      }
    }")
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(not (__ "(start, end]"))
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(not (__ "())"))
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(not (__ "[ { ] } "))
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(__ "([]([(()){()}(()(()))(([[]]({}()))())]((((()()))))))")
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(not (__ "([]([(()){()}(()(()))(([[]]({}([)))())]((((()()))))))"))
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(not (__ "["))


Code which fills in the blank: