LinearSearch.js

/*
 * Linear search or sequential search is a method for finding a target
 * value within a list. It sequentially checks each element of the list
 * for the target value until a match is found or until all the elements
 * have been searched.
 */
function SearchArray(searchNum, ar, output = (v) => console.log(v)) {
 const position = Search(ar, searchNum)
 if (position !== -1) {
 output('The element was found at ' + (position + 1))
 } else {
 output('The element not found')
 }
}

// Search “theArray” for the specified “key” value
function Search(theArray, key) {
 for (let n = 0; n < theArray.length; n++) {
 if (theArray[n] === key) {
 return n
 }
 }
 return -1
}

export { SearchArray, Search }

// const ar = [1, 2, 3, 4, 5, 6, 7, 8, 9]
// SearchArray(3, ar)
// SearchArray(4, ar)
// SearchArray(11, ar)