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?

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?

• javascript
• arrays
• node.js

4 Answers 4

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

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)

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)

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"))