What is the best way to extract characters from the end of a string in JavaScript?

I have a series of binary strings with various lengths, but I want to extract the last 18 characters from each. In the examples provided below, the bolded part is what should remain.

11001000000000000001010

110000000001101011100

How can I achieve this using JavaScript?

Answer №1

To get a specific portion of a string in JavaScript, you can utilize negative index values with the String.prototype.slice() function.

  • When using a negative index as the first argument, it will return the sliced string starting from 6 elements counting from the end of the original string.

var sample = "programming";
console.log(sample.slice(-6)); 

  • If you use a negative index as the second argument, it will slice the string from element 0 to the 6th element counted from the end - this is the opposite behavior compared to the previous method.

var sample = "programming";

console.log(sample.slice(0, -6));

In your case, it is recommended to employ the second method mentioned above.

console.log('101010000000010100111'.slice(0, -12));

console.log('1100110001001101100011'.slice(0, -12));

If you wish to explore more about this function, check out: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/slice

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