检查数组中的每个元素是否都有特定值 [英] Check if every element in array has a specfic value

问题描述

我有一个包含整数的数组；和一个返回字符串的函数.在此示例中，该函数根据是否执行过特定任务这一事实，返回'solved'或'unsolved'.

I have an array with integers in it; and a function that returns a string. In this example, the function returns either 'solved' or 'unsolved', based on the fact if a specific task was done before or not.

现在，我需要一种以每个数组元素作为参数调用我的函数，并检查函数是否为每个元素返回'solved'的方法.

Now I need a way to call my function with every array element as parameter and check if the function returns 'solved' for every element.

带有实际值的小例子:

var array1 = [2,5,8]; // 2 is solved, 5 is solved, 8 is unsolved
var array2 = [2,5,6]; // every element is solved

if (Function returns solved for every element) {
// array2 would be accepted for this part
}
else {
// array1 would go in this branch
}

推荐答案

Array.prototype.every()

every()方法测试数组中的所有元素是否通过提供的功能实现的测试.

The every() method tests whether all elements in the array pass the test implemented by the provided function.

如果您已经有一个返回字符串的函数( ie 'solved'或'unsolved')，则可以在提供给.every()的回调中将其简单地转换为布尔值.

If you already have a function that returns a string (i.e. 'solved' or 'unsolved'), then you can simply convert that to a boolean inside the callback you supply to .every().

var array1 = [2, 5, 8]; // 2 is solved, 5 is solved, 8 is unsolved
var array2 = [2, 5, 6]; // every element is solved

function isSolvedString(operand) {
  return operand < 8 ? 'solved' : 'unsolved';
}

function isSolved(current) {
  return isSolvedString(current) === 'solved' ? true : false;
}

console.log(array1.every(isSolved)); // false
console.log(array2.every(isSolved)); // true

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