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linearSearch javascript Code Snippet in 2024

algorithmarraybeginner

Last Updated: 16 September 2024

Finds the first index of a given element in an array using the linear search algorithm.

  • Use a for...in loop to iterate over the indexes of the given array.
  • Check if the element in the corresponding index is equal to item.
  • If the element is found, return the index, using the unary + operator to convert it from a string to a number.
  • If the element is not found after iterating over the whole array, return -1.
const linearSearch = (arr, item) => { for (const i in arr) { if (arr[i] === item) return +i; } return -1; };
linearSearch([2, 9, 9], 9); // 1 linearSearch([2, 9, 9], 7); // -1

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