检查数组中的所有内部 arrays 是否存在至少一个特定值（JavaScript）

Question

I have the array "arr" which contains 2 objects and each object has the array "innerArr" which contains 2 or 3 objects with one value "val" for each object:

let arr = [
  {
    innerArr: [
      { val: "Apple" },
      { val: "Grape" }
    ]
  },
  {
    innerArr: [
      { val: "Peach" },
      { val: "Mango" },
      { val: "Kiwi" }
    ]
  }
];

Now, I want to check if at least one specific value like "Kiwi" exists looking through all inner arrays "innerArr" in the array "arr" .

I created the code to check if at least one specific value "Kiwi" exists and it returns "true" .

let result = false;

for(let i = 0; i < arr.length; i++) {
  for(let j = 0; j < arr[i].innerArr.length; j++) {
    if(arr[i].innerArr[j].val == "Kiwi") { // Check if "Kiwi" exists
      result = true;
    }
  }
}

console.log(result); // true

This is the full runnable code :

 let arr = [ { innerArr: [ { val: "Apple" }, { val: "Grape" } ] }, { innerArr: [ { val: "Peach" }, { val: "Mango" }, { val: "Kiwi" } ] } ]; let result = false; for(let i = 0; i < arr.length; i++) { for(let j = 0; j < arr[i].innerArr.length; j++) { if(arr[i].innerArr[j].val == "Kiwi") { // Check if "Kiwi" exists result = true; } } } console.log(result); // true

In addition, this is the case of "Strawberry" which returns "false" :

 let arr = [ { innerArr: [ { val: "Apple" }, { val: "Grape" } ] }, { innerArr: [ { val: "Peach" }, { val: "Mango" }, { val: "Kiwi" } ] } ]; let result = false; for(let i = 0; i < arr.length; i++) { for(let j = 0; j < arr[i].innerArr.length; j++) { if(arr[i].innerArr[j].val == "Strawberry") { // Check if "Strawberry" exists result = true; } } } console.log(result); // false

However, I want to make this code with "Kiwi" simpler. Are there any ways to make this code simpler?

let result = false;

for(let i = 0; i < arr.length; i++) {
  for(let j = 0; j < arr[i].innerArr.length; j++) {
    if(arr[i].innerArr[j].val == "Kiwi") { // Check if "Kiwi" exists
      result = true;
    }
  }
}

console.log(result); // true

Answer 1

You can use .some

 let arr = [ { innerArr: [ { val: "Apple" }, { val: "Grape" } ] }, { innerArr: [ { val: "Peach" }, { val: "Mango" }, { val: "Kiwi" } ] } ]; let fruit = "Kiwi" let result = arr.some(({ innerArr }) => innerArr.some(({val}) => val === fruit)) console.log(result)

Its even faster then your loop because .some stops looping after it finds the searched result

Answer 2

 let arr = [ { innerArr: [ { val: "Apple" }, { val: "Grape" } ] }, { innerArr: [ { val: "Peach" }, { val: "Mango" }, { val: "Kiwi" } ] } ]; let fruits = arr.flatMap(e => e.innerArr).map(e => e.val) console.log(fruits) console.log(fruits.includes('Kiwi'))

Answer 3

Use some() function :

 let arr = [ { innerArr: [ { val: "Apple" }, { val: "Grape" } ] }, { innerArr: [ { val: "Peach" }, { val: "Mango" }, { val: "Kiwi" } ] } ]; // Check if "Kiwi" exists let result = arr.some(v1 => v1.innerArr.some(v2 => v2.val == "Kiwi")); console.log(result); // true // Check if "Strawberry" exists result = arr.some(v1 => v1.innerArr.some(v2 => v2.val == "Strawberry")); console.log(result); // false