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About stdlib...

We believe in a future in which the web is a preferred environment for numerical computation. To help realize this future, we've built stdlib. stdlib is a standard library, with an emphasis on numerical and scientific computation, written in JavaScript (and C) for execution in browsers and in Node.js.

The library is fully decomposable, being architected in such a way that you can swap out and mix and match APIs and functionality to cater to your exact preferences and use cases.

When you use stdlib, you can be absolutely certain that you are using the most thorough, rigorous, well-written, studied, documented, tested, measured, and high-quality code out there.

To join us in bringing numerical computing to the web, get started by checking us out on GitHub, and please considerfinancially supporting stdlib. We greatly appreciate your continued support!

replaceBefore

Replace the substring before the first occurrence of a specified search string.

Installation

npm install @stdlib/string-base-replace-before

Alternatively,

To load the package in a website via ascript tag without installation and bundlers, use theES Module available on theesm branch (seeREADME).
If you are using Deno, visit thedeno branch (seeREADME for usage intructions).
For use in Observable, or in browser/node environments, use theUniversal Module Definition (UMD) build available on theumd branch (seeREADME).

Thebranches.md file summarizes the available branches and displays a diagram illustrating their relationships.

To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.

Usage

varreplaceBefore=require('@stdlib/string-base-replace-before');

replaceBefore( str, search, replacement, fromIndex )

Replaces the substring before the first occurrence of a specified search string.

varout=replaceBefore('beep boop',' ','loop',0);// returns 'loop boop'out=replaceBefore('beep boop','o','bar',0);// returns 'baroop'

To begin searching from a specific index, provide a correspondingfromIndex argument.

varout=replaceBefore('beep boop','p','bar',5);// returns 'barp'

IffromIndex is less than zero, the starting index is resolved relative to the last string character, with the last string character corresponding tofromIndex = -1.

varout=replaceBefore('beep boop beep',' ','loop',-6);// returns 'loop beep'

Notes

If a search string is not present in a provided string, the function returns the provided string unchanged.
If a search string is an empty string, the function returns the provided string unchanged.
IffromIndex resolves to an index which is greater than or equal tostr.length, the function returns the provided string unchanged.

Examples

varreplaceBefore=require('@stdlib/string-base-replace-before');varout=replaceBefore('beep boop','p','see',0);// returns 'seep boop'out=replaceBefore('Hello World!','xyz','foo',0);// returns 'Hello World!'out=replaceBefore('Hello World!','','foo',0);// returns 'Hello World!'out=replaceBefore('','xyz','foo',0);// returns ''

Notice

This package is part ofstdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.

For more information on the project, filing bug reports and feature requests, and guidance on how to developstdlib, see the main projectrepository.