Chain: Internal Function

chain-internal-function.markdown

Chain: Internal Function

A Pen by greeeeg on CodePen.

License.

script.babel

console.clear();

var Given = function() {
  const Internal = function(num) {
    this.newNum = num;

    this.add = function(num) {
      this.newNum = num + this.newNum;
      return this;
    };
    this.subtract = function(num) {
      this.newNum = this.newNum - num;
      return this;
    };

    this.multiply = function(num) {
      this.newNum = this.newNum * num;
      return this;
    };

    this.divide = function(num) {
      this.newNum = this.newNum / num;
      return this;
    };

    this.value = function(num) {
      return this.newNum;
    };
  };

  return function(num) {
    return new Internal(num);
  };
};

var given = Given();

console.log(given(2).add(2).subtract(2).divide(1).multiply(2).value());