scratch.js

global.wtf = function wtf(label, whatnot) {
  if (!whatnot){
    whatnot = label
    label = undefined
  }

  if (typeof whatnot == "function") {
    var out = whatnot.toString()
  } else if (typeof whatnot == "object") {
    if (Array.isArray(whatnot)) {
      var out = JSON.stringify(whatnot)
    } else {
      var out = "[ object "+whatnot.constructor.name+" with keys "+Object.keys(whatnot).join(", ")+" ]"
    }
  } else {
    var out = JSON.stringify(whatnot)
  }

  if (label) {
    console.log(label, out)
  } else {
    console.log(out)
  }
}



var references = []
function ignoreCircularReferences(key, value) {
  if (typeof value === 'object' && value !== null) {
    var isCached = references.indexOf(value) !== -1
    if (isCached) { return "<<< CIRCLE >>>" }
    references.push(value)
  }
  return value
}

// var a = {}
// a.a = a
// JSON.stringify(a, ignoreCircularReferences)