Convert hyphens to camel case (camelCase)

Question

With regex (i assume) or some other method, how can i convert things like:

marker-image or my-example-setting to markerImage o

Answer 1

Another take.

Used when...

var string = "hyphen-delimited-to-camel-case"
or
var string = "snake_case_to_camel_case"


function toCamelCase( string ){
  return string.toLowerCase().replace(/(_|-)([a-z])/g, toUpperCase );
}

function toUpperCase( string ){
  return string[1].toUpperCase();
}

Output: hyphenDelimitedToCamelCase

Answer 2

// Turn the dash separated variable name into camelCase.
str = str.replace(/\b-([a-z])/g, (_, char) => char.toUpperCase());

Answer 3

Use this if you allow numbers in your string.

Obviously the parts that begin with a number will not be capitalized, but this might be useful in some situations.

function fromHyphenToCamelCase(str) {
  return str.replace(/-([a-z0-9])/g, (g) => g[1].toUpperCase())
}

function fromHyphenToCamelCase(str) {
  return str.replace(/-([a-z0-9])/g, (g) => g[1].toUpperCase())
}

const str1 = "category-123";
const str2 = "111-222";
const str3 = "a1a-b2b";
const str4 = "aaa-2bb";

console.log(`${str1} => ${fromHyphenToCamelCase(str1)}`);
console.log(`${str2} => ${fromHyphenToCamelCase(str2)}`);
console.log(`${str3} => ${fromHyphenToCamelCase(str3)}`);
console.log(`${str4} => ${fromHyphenToCamelCase(str4)}`);

Answer 4

Just a version with flag, for loop and without Regex:

function camelCase(dash) { 

  var camel = false;
  var str = dash;
  var camelString = '';

  for(var i = 0; i < str.length; i++){
    if(str.charAt(i) === '-'){
      camel = true;

    } else if(camel) {
      camelString += str.charAt(i).toUpperCase();
      camel = false;
    } else {
      camelString += str.charAt(i);
    }
  } 
  return camelString;
}

Answer 5

Here is my implementation (just to make hands dirty)

/**
 * kebab-case to UpperCamelCase
 * @param {String} string
 * @return {String}
 */
function toUpperCamelCase(string) {
  return string
    .toLowerCase()
    .split('-')
    .map(it => it.charAt(0).toUpperCase() + it.substr(1))
    .join('');
}

Answer 6

This is one of the great utilities that Lodash offers if you are enlightened and have it included in your project.

var str = 'my-hyphen-string';
str = _.camelCase(str);
// results in 'myHyphenString'