Finding occurrence of first string in an array in js

Question

Suppose I am given an array

myArray=[10,true,1.5,'Asia', 20, 'rat'];

Now which function should I use to get the index of the first occurrence of a string in array?

Answer 1

You can use findIndex()

 const result = [10,true,1.5,'Asia', 20, 'rat'].findIndex(item => typeof item === "string"); console.log(result);

The findIndex() method returns the index of the first element in the array that satisfies the provided testing function.

Source: MDN Web Docs

Answer 2

If you want to find the first index of the string then findIndex would be one of the best options.

 const myArray = [10, true, 1.5, "Asia", 20, "rat"]; const index = myArray.findIndex((s) => typeof s === "string"); console.log(index);

Answer 3

Use findIndex

 const myArray=[10,true,1.5,'Asia', 20, 'rat']; const index = myArray.findIndex( ( el ) => { return typeof el === 'string'; } ); console.log('Answer: ', index);

Answer 4

Normally you can use findIndex, but you can also use normal for.. loop and break

 let myArray = [10, true, 1.5, 'Asia', 20, 'rat']; let ind = -1; for (let x = 0; x < myArray.length; x++) { if (typeof myArray[x] === 'string') { ind = x; break; } } console.log(ind)

Answer 5

For completeness, here's the Mozilla's specification of the Array.prototype.filter() method.