rjust

rjust is a string method used in several programming languages to right-justify text within a specified field width by padding on the left. It is commonly used for formatting output in consoles, reports, or tables, where consistent column alignment is desirable. The core idea is to produce a string whose length equals the target width, adding a fill character or string to the left if the original string is shorter than the width. If the input string is already as long as or longer than the target width, the original string is returned.

In Python, the method is str.rjust(width, fillchar=' '). The fillchar, if provided, must be a single character; otherwise a TypeError is raised. If width <= len(s), s is returned unchanged.

In Ruby, the method is String#rjust(width, padstr=' '). The padstr can be more than one character, and padding is created by repeating padstr as needed and truncating if necessary. If width <= length, the original string is returned.

In JavaScript, the equivalent is String.prototype.padStart(targetLength, padString). If padString is omitted, a single space is used. If targetLength <= string length, the original string is returned. padString may be made up of multiple characters and is repeated and truncated to fit the target length.

Related methods include ljust and center, which left-justify or center-align text, respectively. rjust remains a common tool for fixed-width formatting and alignment across various programming contexts.