包括还是包括？

Question

我想写：

if ( (val = "") **and**if ((val = "") or (val = "") or (val = "")) ), 

那么..

 if (val.reduce((acc, val) => acc.concat(val), []).includes("CH Nord Mayenne") 
  && val.reduce((acc, val) => acc.concat(val), []).includes('Douleur','Psychologie','Nutrition'))

    { CHNM.addTo(myfrugalmap) ;} else {CHNM.remove();}

我如何写“或”运算符？

Answer 1

一种方法是编写自己的函数并提供一个包含逻辑运算符的字符串，如下所示：

你可以解析出每个条件并检查值是否在源数组中

var val = [[1,2,"3"], ["4",5,6], [7,8,9]];
var vals = val.reduce((acc, val) => acc.concat(val), []);
    
function orIncludes(source, testString) {
  var orValues = testString.split("||").map(val => {
    try {
      return JSON.parse(val.trim())
    }catch(e) {
      return val.trim();
    }
  });
  return orValues.some(val => source.includes(val));
}

console.log(orIncludes(vals, '10 || 12 || 3 || "4"')); // true - matches "4"
console.log(orIncludes(vals, '"3" || 8 || 3 || "4"')); // true - matches "3"
console.log(orIncludes(vals, '"2" || 2 || 5 || "19"')); // true - matches 2
console.log(orIncludes(vals, '10 || 12 || "9" || 4')); // false -  no match

一个更简单的方法如果您不关心组合 OR 和 AND（如果您使用 && 扩展它，上面将允许您这样做）是简单地传入将单个值作为参数并检查它们，如下所示：

var val = [[1, 2, "3"],["4", 5, 6],[7, 8, 9]];
var vals = val.reduce((acc, val) => acc.concat(val), []);

function orIncludes(source, ...testValues) {
  return testValues.some(val => source.includes(val));
}

console.log(orIncludes(vals, 10, 12, 3, "4")); // true - matches "4"
console.log(orIncludes(vals, "3", 8, 3, "4")); // true - matches "3"
console.log(orIncludes(vals, "2", 2, 5, "19")); // true - matches 2
console.log(orIncludes(vals, 10, 12, "9", 4)); // false -  no match

更适合您的情况：

var vals = val.reduce((acc, val) => acc.concat(val), []);
if (vals.includes("CH Nord Mayenne") && orIncludes(vals, 'Douleur','Psychologie','Nutrition')){ 
  CHNM.addTo(myfrugalmap);
} else {
  CHNM.remove();
}