JavaScript Array Search
JavaScript Array Search
In JavaScript Array Search provides several methods to search for elements in an array — such as checking if a value exists, finding its index, or returning the matching value.
1. indexOf() – Find Index of Value
Returns the index of the first matching element.
If not found, it returns -1.
2. lastIndexOf() – Find Last Occurrence
Works like indexOf() but searches from the end.
3. includes() – Check If Value Exists
Returns true or false.
4. find() – Returns First Matching Value
Used for searching based on a condition.
5. findIndex() – Returns Index of First Match
6. search() Using some() (Check Condition)
Returns true if at least one element matches.
7. every() – Check if All Elements Match Condition
Summary Table
| Method | Returns | Purpose |
|---|---|---|
indexOf() | Index or -1 | Search exact value |
lastIndexOf() | Index or -1 | Last match search |
includes() | true / false | Check if exists |
find() | Value | First match based on condition |
findIndex() | Index | First match index based on condition |
some() | true / false | At least one matches |
every() | true / false | All must match |
