test for balanced braces, parentheses, brackets

balanced.js

// 10 Jan 2020
// beautiful's interview question 
// better solution than https://gist.github.com/dfkaye/2e87303396fdd0402e01062594d4e89c from Consensus

function balanced(string) {
  var p = string.length && string.length % 2 === 0;

  if (!p) {
    return false;
  }
  
  var re = /(\{\})|(\(\))|(\[\])/;
  
  var m;
  
  while (m = string.match(re)) {
    string = string.replace(m[0], '');
  }
  
  return string.length === 0;
}

/* test it out */

var tests = [
  "{}",
  "({})",
  "[({})]",
  "{(})",
  "{{}",
  ""
];

var results = tests.map(function(test) {
  return balanced(test);
})

var report = JSON.stringify(results, null, 2);

console.log(report);