155.min-stack.js

/*
 * @lc app=leetcode id=155 lang=javascript
 *
 * [155] Min Stack
 */

// @lc code=start

var MinStack = function() {
  this.elements = [];
};

/**

 @param {number} x
 @return {void}
 */

MinStack.prototype.push = function(x) {
  this.elements.push({
    value: x,
    min: this.elements.length === 0 ? x : Math.min(x, this.getMin()),
  });
};
/**

 @return {void}
 */
MinStack.prototype.pop = function() {
  this.elements.pop();
};
/**

 @return {number}
 */
MinStack.prototype.top = function() {
  return this.elements[this.elements.length - 1].value;
};
/**

 @return {number}
 */
MinStack.prototype.getMin = function() {
  return this.elements[this.elements.length - 1].min;
};

/** 
 * Your MinStack object will be instantiated and called as such:
 * var obj = new MinStack()
 * obj.push(val)
 * obj.pop()
 * var param_3 = obj.top()
 * var param_4 = obj.getMin()
 */
// @lc code=end

// const minStack = new MinStack();
// minStack.push(-2);
// minStack.push(0);
// minStack.push(-3);
// minStack.getMin(); // return -3
// minStack.pop();
// minStack.top();    // return 0
// minStack.getMin(); // return -2

// console.log(minStack)