循环思想一个多维数组

Question

I try to return a multidimensional array into a function to iterate it but I'm not sure what's wrong with my logic

const arr = [[1,2], [3,4],[5,6]]

for(let i = 0; i < thirdInterval.length-1; i++){
    getNumbers(thirdInterval[i], thirdInterval[i+1])
}

The result that I want to achieve is return the first element into the first argument of the function and the second element of the array into the second argument of the function.

Answer 1

What you are doing here is looping through the array and getting only the array at the index i, eg arr[0] which is [1,2] . and (thirdInterval[i], thirdInterval[i+1]) is actually equals to ([1,2], [3,4])

to access the first and second elements you should address them like the following:

for(let i = 0; i < thirdInterval.length-1; i++){
    getNumbers(thirdInterval[i][0], thirdInterval[i][1])
}

Answer 2

const arr = [[1,2][3,4][5,6]];

for (var i = 0; i < arr.length; i++;) {
    func(arr[i][0], arr[i][1];
}

Answer 3

You are iterating an array with sub-arrays, which means that thirdInterval[i] contains two items. You can get the items using the indexes thirdInterval[i][0] and thirdInterval[i][1] , but since you're calling a function with those values, you can use spread instead - getNumbers(...thirdInterval[i]) .

In addition, the loop's condition should be i < thirdInterval.length if you don't want to skip the last item.

Demo:

 const thirdInterval = [[1,2],[3,4],[5,6]] const getNumbers = console.log // mock getNumbers for (let i = 0; i < thirdInterval.length; i++) { getNumbers(...thirdInterval[i]) }