First digit is 3, so the only possibilities for first digit are : -> 3 -> horizontal/vertical adjacents (in this case 2 or 6).
This comment is hidden because it contains spoiler information about the solution
This is ES6 syntax.
Currently you can't run it in all browsers. I think FF could run it. You still can try the function using Babel'REPL.
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First digit is 3, so the only possibilities for first digit are :
-> 3
-> horizontal/vertical adjacents (in this case 2 or 6).
This comment is hidden because it contains spoiler information about the solution
This is ES6 syntax.
Currently you can't run it in all browsers. I think FF could run it.
You still can try the function using Babel'REPL.