How to lower case a string in Typescript?

Question

I am comparing two strings and I want to lower case a string before comparing. How can I do this? This is my code:

 this.products = response.responseData.sort(function(a,b){

                     if(a.product.productName < b.product.productName){
                         return -1;
                     }
                     if(a.product.productName > b.product.productName){
                         return 1;
                     }
                     return 0;
                 });

Possible duplicate of how to compare two string regardless of lowercase and uppercase using angular js — Nico Haase
– Nico Haase, Commented Jul 20, 2018 at 13:06

severus256 · Accepted Answer · 2018-07-20 13:07:09Z

44

Just use the:

.toLowerCase()

method.

In your case:

if(a.product.productName.toLowerCase() < b.product.productName.toLowerCase()){
                         return -1;
                     }

answered Jul 20, 2018 at 13:07

severus256

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Comments

user6749601 · Accepted Answer · 2018-07-20 13:07:11Z

2

Use Javascript's .toLowerCase().

this.products = response.responseData.sort(function(a,b){

                 if(a.product.productName.toLowerCase() < b.product.productName.toLowerCase()){
                     return -1;
                 }
                 if(a.product.productName.toLowerCase() > b.product.productName.toLowerCase()){
                     return 1;
                 }
                 return 0;
             });

answered Jul 20, 2018 at 13:07

user6749601

Comments

captain-yossarian from Ukraine · Accepted Answer · 2020-09-15 12:42:40Z

2

You can use new string case operators which are available in TypeScript 4.1.0

Please see example:

type LowerCase<T extends string> = `${lowercase T}`;
const lower = <T extends string>(str: T) => str.toLowerCase() as LowerCase<T>;
const result = lower('UP'); // 'up'

For more information see this PR

answered Sep 15, 2020 at 12:42

captain-yossarian from Ukraine

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Comments

pavan Jambigi · Accepted Answer · 2022-03-25 15:59:32Z

0

The answer is toLowerCase(). In this, for numbers, special characters will not be converted to lowercase, it is as it is.

answered Mar 25, 2022 at 15:59

pavan Jambigi

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