Stack

-- Python --

class Stack():

def __init__(self):

self.data = []

self.top = 0

#self.max = 100

def push(self, value):

self.data.append(value)

self.top += 1

def pop(self):

if self.top is 0:

print('Error. Stack is empty.')

return

self.top -= 1

data = self.data[self.top]

del self.data[self.top]

return data

def peek(self):

if self.top is 0:

print('Error. Stack is empty')

return

return self.data[self.top-1]

def size(self):

return self.top

def clear(self):

self.top = 0

self.data = []

def state(self):

print(self.data)

### Test Code ###

s = Stack()

s.push('hello world')

s.push('hello python')

s.state()

print('pop : ' + str(s.pop()))

print('peek : ' + str(s.peek()))

print('size : ' + str(s.size()))

s.state()

s.clear()

s.state()

Result

-- Javascript --

function Stack() {

let data = [];

let top = 0;

// this.max = 100;

this.push = (value) => {

data[top++] = value;

};

this.pop = () => {

if(top === 0) console.log("Error. Stack is empty");

else {

let popedValue = data[--top];

// delete data[top];

data.splice(top, 1);

return popedValue;

}

};

this.peek = () => {

if(top === 0) console.log("Error. Stack is empty");

else return data[top - 1];

};

this.size = () => top;

this.clear = () => {

top = 0;

data = {};

};

this.state = () => {

console.log(data);

};

}

/* Test Code */

let s = new Stack();

s.push("hello world");

s.push("hello javascript");

s.state();

console.log(`pop : ${s.pop()}`);

console.log(`peek : ${s.peek()}`);

console.log(`size : ${s.size()}`);

s.state();

s.clear();

console.log("=== after clear ===");

s.state();

Result

( 설명 추가 예정 )