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I have an array of strings. I want to remove first character from each element of that array.

I looped through the array and tried to remove the first character by using substr method.

 var x = ["X2019","X2020","X2021","X2022"];
    
for(i = 0; i < x.length; i++) {
  result = x[i].substr(1);
}
console.log(result);

I need an array like

result = ["2019","2021","2022"];

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  • 3
    In your example, result is not an array. Second, substr returns a new string. Third try functional looping methods like Array.map Commented Aug 21, 2019 at 7:37

2 Answers 2

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You can use .map() and .slice() methods to get the desired output:

var x = ["X2019","X2020","X2021","X2022"];

var y = x.map(s => s.slice(1));

console.log(y);

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You are not storing value returned from substr() call in a loop. Assigning to a variable means only the last value will be available.

Declare a result array and push to it.

var x = ["X2019", "X2020", "X2021", "X2022"];
var result = []
for (i = 0; i < x.length; i++) {
    result.push(x[i].substr(1));
}
console.log(result);

Even the shorter syntax by using map() function:

var x = ["X2019", "X2020", "X2021", "X2022"];
var result = x.map(value => value.substr(1));
console.log(result);

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