How to use For loop In Javascript
Looping in programming languages is a feature that facilitates the execution of a set of instructions repeatedly until some condition evaluates and becomes false. We come across for loop which provides a brief and systematic way of writing the loop structure.
Syntax:
for (statement 1 ; statement 2 ; statement 3){
code here...
}
Example: In this example, we will loop till the given index and store characters in the result string.
// JavaScript to keep only first
// 'n' characters of String
// Original string
let str = "w3wiki";
// Keep first 5 letters
let n = 5;
let res = "";
console.log("Original String = " + str);
console.log("n = " + n);
// Loop till given number of characters
for (let i = 0; i < n; i++) {
res += str[i];
}
console.log(
"Keep first " + n +
" characters of original String = "
+ res
);
Output
Original String = w3wiki n = 5 Keep first 5 characters of original String = Geeks
JavaScript to keep only first N characters in a string
In this article, we have given a string and the task is to keep only the first n characters of the string using JavaScript. There are various methods to solve this problem, some of which are discussed below: