Nodejs Utililty Methods Array Remove If

Array.prototype.removeIf = function(callback) {
    var i = this.length;
    while (i--) {
        if (callback(this[i], i)) {
            this.splice(i, 1);
};

Array.prototype.removeIf = function(predicate)
  var count = 0;
  for (var i = 0; i < this.length; i++)
    if (predicate(this[i]))
      this.splice(i, 1);
      count++;
...

Array.prototype.removeIf = function(removeFunction) {
    var index = 0;
    while (index < this.length) {
        if (removeFunction(this[index])) {
            this.splice(index, 1);
        } else {
            index++;
};

Array.prototype.removeIfTrue = function (func) {
  this.forEach((el) => {
    if (func(el)) {
      this.splice(this.indexOf(el, 1))
  })

Array.prototype.removeOneByPredicate = function (pr) {
    var index = this.indexOf(this.first(pr));
    if (index != -1) {
        this.splice(index, 1);
        return true;
};