js 进制转换
js & notes
parseInt & toString
let result = [1,0,1];
result = [1,0,1].join()
// "1,0,1"
result = [1,0,1].join(``)
// "101"
result = parseInt([1,0,1].join(``))
// 101
result.toString(10);
// "101"
result.toString(2);
// "1100101"
parseInt([1,0,1].join(``));
// 101
parseInt([1,0,1].join(``), 2);
// 5
const log = console.log;
// 十进制转其他进制
const x = 110;
log(x.toString(2));
log(x.toString(8));
log(x.toString(16));
// 其他进制转十进制
const x = `110`;
log(parseInt(x, 2));
log(parseInt(x, 8));
log(parseInt(x, 16));
// 其他制转转其他制转
// 先用 parseInt 转成十进制, 再用 toString 转到目标进制
log(String.fromCharCode(parseInt(141, 8)))
log(parseInt('ff', 16).toString(2));
LeetCode
https://leetcode.com/problems/convert-binary-number-in-a-linked-list-to-integer/
/**
* Definition for singly-linked list.
* function ListNode(val, next) {
* this.val = (val===undefined ? 0 : val)
* this.next = (next===undefined ? null : next)
* }
*/
/**
* @param {ListNode} head
* @return {number}
*/
var getDecimalValue = function(head) {
const result = [];
while(head) {
result.push(head.val)
head = head.next;
}
return parseInt(result.join(``), 2);
};
位运算
/**
* Definition for singly-linked list.
* function ListNode(val, next) {
* this.val = (val===undefined ? 0 : val)
* this.next = (next===undefined ? null : next)
* }
*/
/**
* @param {ListNode} head
* @return {number}
*/
var getDecimalValue = function(head) {
let val = 0;
while (head) {
val = (val << 1) | head.val;
head = head.next;
}
return val;
};
refs
https://www.jianshu.com/p/6f60a6b7f3b8
https://blog.csdn.net/lk188/article/details/4317459
https://juejin.im/post/6844903846209126407
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