Get index of array which contains/include string value in javascript/Node.js

Question

My question is how to get index of array which contains/includes string value. See my code below to get the result I want.

This is simple code to get index of array:

var myarr = ["I", "like", "turtles"];
var arraycontainsturtles = (myarr.indexOf("turtles"));
console.log(arraycontainsturtles) // the result will be 2

I want to get the index result with a code sample below:

var myarr = ["I", "like", "turtles"];
var arraycontainsturtles = (myarr.indexOf("turt"));
console.log(arraycontainsturtles) // i want the result will be 2 with the contains string just the 'turt' only.

How to get the index with a contains string value like at the sample number 2? The real result of the number 2 will be -1.

How do I do that?

Kevin Drost · Accepted Answer · 2018-04-11 11:36:02Z

1

Use findIndex instead of indexOf, as you can provide a function.

var myarr = ["I", "like", "turtles"];
var arraycontainsturtles = (myarr.findIndex(function(item){
    return item.indexOf("turt")!==-1;
}));
console.log(arraycontainsturtles) // 2

answered Apr 11, 2018 at 11:36

Kevin Drost

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1 Comment

Didi Rumapea Over a year ago

thanks it solved. another answer is good. but this code is very simple .. thanks @Kevin Drost

nisar · Accepted Answer · 2018-04-11 11:30:43Z

0

var myarr = ["I", "like", "turtles"];
    var arraycontainsturtles = -1;
    for(i=0;i<myarr.length;i++){
    if((myarr[i].indexOf("turt")) != -1){
           arraycontainsturtles = i;
    }
    }
    console.log(arraycontainsturtles)

answered Apr 11, 2018 at 11:30

nisar

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2 Comments

Kevin Drost Over a year ago

It works in this case, but does not return the first index when "turt" exists more than once in the array

nisar Over a year ago

@KevinDrost, there is no proper req in question to get only first index. off you can use break to come out the loop ,after find out the index.

Tobias Fuchs · Accepted Answer · 2018-04-11 11:31:23Z

0

Hope this is what your looking for

var myarr = ["I", "like", "turtles"];
var search = "turt";
var arraycontainsturtles = myarr.reverse().reduce((a, v, i) => v.indexOf(search) != -1 ? Math.abs(i - myarr.length + 1) : a, -1);
console.log(arraycontainsturtles)

answered Apr 11, 2018 at 11:31

Tobias Fuchs

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Comments

Akanksha Sharma · Accepted Answer · 2018-04-11 11:52:07Z

0

var myarr = ["I", "like", "turtles"];
var arraycontainsturtles = function(arr, str){
  let filter = -1;
  filter = arr.findIndex((e) => {
     return e.indexOf(str) > -1 ; 
  });
 return filter;
}

console.log(arraycontainsturtles(myarr, "turt"))

answered Apr 11, 2018 at 11:52

Akanksha Sharma

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