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Stack and queue operations in Javascript

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2021-04-12 10:45:081468browse

Stack and queue operations in Javascript

Heap and Stack are both a data structure in which data items are arranged in order, which involves data The storage method in memory, Javascript, as a scripting language, naturally cannot avoid the operation of heap, stack.

1. Stack operation

mainly uses the two methods pop() and push(). Add/delete elements from the end of the array.

   <script>
           let arr=[];
         //入栈push(),返回值为数组长度
            console.log(arr.push(1,2,3));
            console.log(arr);
            console.log(arr.push(4));
            console.log(arr);
            //出栈pop()
            console.log(arr.pop());
            console.log(arr);
            console.log(arr.pop());
            console.log(arr);
    </script>


2. Queue operation

mainly uses unshift() These two methods, shift(), add/delete elements at the beginning of the array.

   <script>
    arr=[];
        arr.unshift("a","b","c");
        console.log(arr);
        //入队列
        arr.unshift("d");
        console.log(arr);
        //出队列
        arr.shift();
        console.log(arr);
        arr.shift();
        console.log(arr);
   </script>


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