How to Truncate a String in JavaScript
November 8, 2023
Truncating a string in JavaScript means cutting it down to a certain length and optionally adding an ellipsis or other ending. This guide covers multiple methods to achieve string truncation tailored for different scenarios.
Understanding string truncation
Truncation is the process of shortening a string by removing characters from the end until it reaches a specified length. Developers might truncate strings to maintain a clean UI where space is limited or to create previews of longer text.
Using the slice
method
The slice
method is the go-to for basic truncation without ending characters:
let str = "The quick brown fox jumps over the lazy dog"; let truncated = str.slice(0, 16); // "The quick brown f"
Adding an ellipsis with slice
To add an ellipsis or any other ending after truncation, concatenate it:
let truncated = str.slice(0, 16) + '...'; // "The quick brown f..."
Creating a truncate function
For reusability, define a function to truncate strings and append an optional ending:
function truncateString(str, length, ending = '...') { if (str.length > length) { return str.slice(0, length - ending.length) + ending; } return str; }
You could ship faster.
Imagine the time you'd save if you never had to build another internal tool, write a SQL report, or manage another admin panel again. Basedash is built by internal tool builders, for internal tool builders. Our mission is to change the way developers work, so you can focus on building your product.
Using substring
for truncation
The substring
method is similar to slice
, but it does not accept negative indices:
let truncated = str.substring(0, 16); // "The quick brown f"
Handling edge cases
Always check the string's length to avoid unnecessary operations:
function safeTruncate(str, length, ending = '...') { if (str.length <= length) return str; return str.slice(0, length - ending.length) + ending; }
Using modern JavaScript features
Template literals and the ternary operator can make truncation more readable:
const truncateES6 = (str, length, ending = '...') => `${str.length > length ? str.slice(0, length - ending.length) + ending : str}`;
Truncating without cutting words
To avoid cutting words, use the lastIndexOf
method to find the last space within the limit:
function truncateAtLastSpace(str, length, ending = '...') { if (str.length <= length) return str; let trimmedString = str.slice(0, length + 1); return trimmedString.slice(0, Math.min(trimmedString.length, trimmedString.lastIndexOf(' '))) + ending; }
TOC
November 8, 2023
Truncating a string in JavaScript means cutting it down to a certain length and optionally adding an ellipsis or other ending. This guide covers multiple methods to achieve string truncation tailored for different scenarios.
Understanding string truncation
Truncation is the process of shortening a string by removing characters from the end until it reaches a specified length. Developers might truncate strings to maintain a clean UI where space is limited or to create previews of longer text.
Using the slice
method
The slice
method is the go-to for basic truncation without ending characters:
let str = "The quick brown fox jumps over the lazy dog"; let truncated = str.slice(0, 16); // "The quick brown f"
Adding an ellipsis with slice
To add an ellipsis or any other ending after truncation, concatenate it:
let truncated = str.slice(0, 16) + '...'; // "The quick brown f..."
Creating a truncate function
For reusability, define a function to truncate strings and append an optional ending:
function truncateString(str, length, ending = '...') { if (str.length > length) { return str.slice(0, length - ending.length) + ending; } return str; }
You could ship faster.
Imagine the time you'd save if you never had to build another internal tool, write a SQL report, or manage another admin panel again. Basedash is built by internal tool builders, for internal tool builders. Our mission is to change the way developers work, so you can focus on building your product.
Using substring
for truncation
The substring
method is similar to slice
, but it does not accept negative indices:
let truncated = str.substring(0, 16); // "The quick brown f"
Handling edge cases
Always check the string's length to avoid unnecessary operations:
function safeTruncate(str, length, ending = '...') { if (str.length <= length) return str; return str.slice(0, length - ending.length) + ending; }
Using modern JavaScript features
Template literals and the ternary operator can make truncation more readable:
const truncateES6 = (str, length, ending = '...') => `${str.length > length ? str.slice(0, length - ending.length) + ending : str}`;
Truncating without cutting words
To avoid cutting words, use the lastIndexOf
method to find the last space within the limit:
function truncateAtLastSpace(str, length, ending = '...') { if (str.length <= length) return str; let trimmedString = str.slice(0, length + 1); return trimmedString.slice(0, Math.min(trimmedString.length, trimmedString.lastIndexOf(' '))) + ending; }
November 8, 2023
Truncating a string in JavaScript means cutting it down to a certain length and optionally adding an ellipsis or other ending. This guide covers multiple methods to achieve string truncation tailored for different scenarios.
Understanding string truncation
Truncation is the process of shortening a string by removing characters from the end until it reaches a specified length. Developers might truncate strings to maintain a clean UI where space is limited or to create previews of longer text.
Using the slice
method
The slice
method is the go-to for basic truncation without ending characters:
let str = "The quick brown fox jumps over the lazy dog"; let truncated = str.slice(0, 16); // "The quick brown f"
Adding an ellipsis with slice
To add an ellipsis or any other ending after truncation, concatenate it:
let truncated = str.slice(0, 16) + '...'; // "The quick brown f..."
Creating a truncate function
For reusability, define a function to truncate strings and append an optional ending:
function truncateString(str, length, ending = '...') { if (str.length > length) { return str.slice(0, length - ending.length) + ending; } return str; }
You could ship faster.
Imagine the time you'd save if you never had to build another internal tool, write a SQL report, or manage another admin panel again. Basedash is built by internal tool builders, for internal tool builders. Our mission is to change the way developers work, so you can focus on building your product.
Using substring
for truncation
The substring
method is similar to slice
, but it does not accept negative indices:
let truncated = str.substring(0, 16); // "The quick brown f"
Handling edge cases
Always check the string's length to avoid unnecessary operations:
function safeTruncate(str, length, ending = '...') { if (str.length <= length) return str; return str.slice(0, length - ending.length) + ending; }
Using modern JavaScript features
Template literals and the ternary operator can make truncation more readable:
const truncateES6 = (str, length, ending = '...') => `${str.length > length ? str.slice(0, length - ending.length) + ending : str}`;
Truncating without cutting words
To avoid cutting words, use the lastIndexOf
method to find the last space within the limit:
function truncateAtLastSpace(str, length, ending = '...') { if (str.length <= length) return str; let trimmedString = str.slice(0, length + 1); return trimmedString.slice(0, Math.min(trimmedString.length, trimmedString.lastIndexOf(' '))) + ending; }
What is Basedash?
What is Basedash?
What is Basedash?
Ship faster, worry less with Basedash
Ship faster, worry less with Basedash
Ship faster, worry less with Basedash
You're busy enough with product work to be weighed down building, maintaining, scoping and developing internal apps and admin panels. Forget all of that, and give your team the admin panel that you don't have to build. Launch in less time than it takes to run a standup.
You're busy enough with product work to be weighed down building, maintaining, scoping and developing internal apps and admin panels. Forget all of that, and give your team the admin panel that you don't have to build. Launch in less time than it takes to run a standup.
You're busy enough with product work to be weighed down building, maintaining, scoping and developing internal apps and admin panels. Forget all of that, and give your team the admin panel that you don't have to build. Launch in less time than it takes to run a standup.
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