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One-liner with match() and length solution in Creative category for Follow Instructions by mounaiban
import assert from "assert";
// z : instructionzz
var follow = (z,f=(s,q)=>(s.match(RegExp(q,'g'))||'').length)=>[f(z,'r')-f(z,'l'),f(z,'f')-f(z,'b')];
console.log('Example:');
console.log(follow('fflff'));
// These "asserts" are used for self-checking
assert.deepEqual(follow('fflff'), [-1, 4]);
assert.deepEqual(follow('ffrff'), [1, 4]);
assert.deepEqual(follow('fblr'), [0, 0]);
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Aug. 18, 2020
