Find index of a number in an array between two elemen-CodePudding

Given the following code,

const arr = [0, 2, 6, 10, 14, 18, 22];

const number = 13;

let index;

I would like to find the index of number where the following condition apply.

number >= to the array element but smaller than the next element.

For example here index would be 3 as arr[3] is bigger than 10 but smaller than 14

I am unsure if there is an array method to find that solution.

Any help I’d appreciate.

CodePudding user response：

You can use findIndex

const arr = [0, 2, 6, 10, 14, 18, 22];
const number = 13;

let index = arr.findIndex((element, index) => number >= element && number < arr[index   1])

console.log(index)

CodePudding user response：

const arr = [0, 2, 6, 10, 14, 18, 22];

const number = 13;

let index;

for (let i = 1; i < arr.length; i  ) {
  const prevNum = arr[i - 1]
  const currNum = arr[i];
  if (prevNum <= number && currNum > number) {
    index = i - 1;
  }
}

console.log(index)