Overview
Introduction
Beyond repeating whole numbers, sometimes the interesting transformation is repeating each digit inside a number in place, stretching 123 into 112233 rather than producing three separate copies of 123.
This tool applies that in-place digit expansion across an entire list of integers at once.
What Is Integer Digit Duplicator?
A digit-level repetition tool: every digit character of each integer's absolute value is repeated a chosen number of times, right where it sits, before moving to the next digit.
The result is a single, longer number per input line, with the original sign preserved in front.
How Integer Digit Duplicator Works
Each line is parsed as an integer, and its sign is separated from its absolute-value digit string.
Every digit character is repeated `Times` times using string repetition, and the repeated digit groups are concatenated in original digit order.
The original sign, if any, is reattached to the front of the expanded digit string to produce the final output line.
When To Use Integer Digit Duplicator
Use it to create a stretched or emphasized variant of a numeric code for visual or novelty purposes.
It's useful for exploring how digit-level repetition affects place value, e.g. as a teaching aid for expanded notation.
Often used alongside Integer Duplicator, Integer Digit Shifter and Integer Digit Clamper.
Features
Advantages
- Keeps digit order intact; only the multiplicity of each digit changes, not their sequence.
- Produces a single combined value per line, unlike Integer Duplicator's multi-line output, which is easier to feed into tools expecting one number per line.
Limitations
- This is a novelty/decorative digit transformation, not a standard arithmetic operation; the resulting number's value has no simple relationship to the original beyond the digit pattern.
- Large Times values on multi-digit numbers can produce very long output strings quickly.
Examples
Best Practices & Notes
Best Practices
- Keep Times small (2-3) for readability; larger values quickly produce long strings that are hard to visually parse.
- Combine with Integer Digit Picker afterward if you want to inspect a specific digit of the expanded result.
Developer Notes
Each digit character is expanded independently with JavaScript's `String.prototype.repeat(times)` and the results are joined in original order, which keeps the implementation a simple map-and-join over the digit string rather than requiring numeric arithmetic.
Integer Digit Duplicator Use Cases
- Creating a stretched, novelty variant of a numeric code or ID for visual effect
- Demonstrating digit-level repetition for teaching place value and string manipulation
- Generating test strings with predictable repeated-digit patterns
Common Mistakes
- Expecting this to repeat the whole number as separate lines like Integer Duplicator does — it repeats digits in place within a single combined value instead.
- Assuming the resulting number retains a simple mathematical relationship (like being multiplied by some factor) to the original; it does not, since digit repetition isn't a standard arithmetic operation.
Tips
- Try Times=1 first to confirm your list parses correctly before scaling up the repetition.
- Pair with Integer Negator if you want every result forced negative regardless of the original sign.