Created
August 19, 2022 16:49
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| // We know that b is the closing char | |
| // Change this if ever the order isn't known | |
| const formsPair = (a: string, b: string): boolean => { | |
| const forms = (a === "{" && b === "}") || | |
| (a === "(" && b === ")") || | |
| (a === "[" && b === "]"); | |
| console.log(["forms pair?", forms]) | |
| return forms; | |
| }; | |
| function isValid(s: string): boolean { | |
| const stack: string[] = []; | |
| const chars = s.split(""); | |
| let valid = true; | |
| chars.forEach(char => { | |
| if (char === "{" || | |
| char === "(" || | |
| char === "[") { | |
| stack.push(char); | |
| } else { | |
| let formsPairs = formsPair(stack[stack.length - 1], char); | |
| console.log(["formspair 2", formsPairs]); | |
| // change this if we ever expect other characters | |
| if (formsPairs) { | |
| console.log("popping"); | |
| console.log(stack); | |
| let la = stack.pop(); | |
| console.log(la) | |
| console.log(stack); | |
| } else { | |
| console.log("invalid"); | |
| valid = false; | |
| } | |
| } | |
| // console.log(char); | |
| // console.log(stack); | |
| }); | |
| if (stack.length) { | |
| valid = false; | |
| } | |
| return valid; | |
| }; |
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