查找字符串中的数字并将它们加在一起 [英] Finding numbers in a string and adding them together

问题描述

我想知道jQuery是否有可能将数字加到字符串中...

I was wondering if it were possible with jQuery to add together numbers in a string...

只能将字符串添加到其自身，如下面的示例所示.如果出现一个或多个字符串，则应将其合并.

The strings can only be added to themselves as shown in the examples below. If one or more of the string appears, it should be combined.

所有可能的字符串:单击此处

带有可能的字符串的示例:

Example with possible strings:

+0.53 attack damage
+0.53 attack damage
= 1.06 attack damage

+8.75 mana
+8.75 mana
= 17.5 mana

其中的每一个最多可以合并 9次.

Each of these can be combined up to 9 times.

推荐答案

使用此正则表达式:

/((-|\+)?([0-9]+|)(\.?[0-9]+))/g

您可以使用 Array.prototype.reduce 像这样将您的数字加起来

You can use Array.prototype.reduce like this to sum your numbers up

var str = 'Hello +0.50 World Hello 1 World Hello -10 World',
    re = /((-|\+)?([0-9]+|)(\.?[0-9]+))/g,
    sum;

sum = (str.match(re) || []).reduce(function (prev, current) {
   if (Object.prototype.toString.call(prev) !== '[object Number]') {
       prev = parseFloat(prev, 10);
   }
   return prev + parseFloat(current, 10);
}, 0);

// sum should be equal to -8.5 here

请注意，str.match(re)可能返回null，因此我们只需确保在数组上调用reduce.

Note that str.match(re) may return null, so we just make sure we call reduce on an array.

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