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Javascript Searching an Array

The recommended way (Since ES5) is to use Array.prototype.find:

let people = [
 { name: "bob" },
 { name: "john" }
];
let bob = people.find(person => person.name === "bob");
// Or, more verbose
let bob = people.find(function(person) {
 return person.name === "bob";
});

In any version of JavaScript, a standard for loop can be used as well:


for (var i = 0; i < people.length; i++) {
 if (people[i].name === "bob") {
 break; 
 }
}

Output

bob

FindIndex

The findIndex() method returns an index in the array, if an element in the array satisfies the provided testing function. Otherwise -1 is returned.


array = [
 { value: 1 },
 { value: 2 },
 { value: 3 },
 { value: 4 },
 { value: 5 }
];
var index = array.findIndex(item => item.value === 3); 
var index = array.findIndex(item => item.value === 12); 

Output

 2
-1


Conclusion

In this page (written and validated by ) you learned about Javascript Searching an Array . What's Next? If you are interested in completing Javascript tutorial, your next topic will be learning about: Javascript Convert a String to an Array.



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