Put simply: sequentially check each element of an array until you find the target value or until all elements have been searched.
Input: Any array of items Time Complexity: O(n)
Implementation:
const array = ['a', 'b', 'c', 'd', 'e', 'f'];
// find the letter e in an array of letters
const linearSearch = (array) => array.find(element => element === 'e');
linearSearch(array);