voca/es/snake_case.js

The ultimate JavaScript string library

import './internal/is_nil.js';
import './is_string.js';
import { c as coerceToString } from './internal/coerce_to_string.js';
import lowerCase from './lower_case.js';
import './internal/const.js';
import './internal/const_extended.js';
import './internal/nil_default.js';
import './internal/to_string.js';
import words from './words.js';

/**
 * Converts the `subject` to <a href="https://en.wikipedia.org/wiki/Snake_case">snake case</a>.
 *
 * @function snakeCase
 * @static
 * @since 1.0.0
 * @memberOf Case
 * @param  {string} [subject=''] The string to convert to snake case.
 * @return {string}              Returns the snake case string.
 * @example
 * v.snakeCase('learning to fly');
 * // => 'learning_to_fly'
 *
 * v.snakeCase('LearningToFly');
 * // => 'learning_to_fly'
 *
 * v.snakeCase('-Learning-To-Fly-');
 * // => 'learning_to_fly'
 */

function snakeCase(subject) {
  var subjectString = coerceToString(subject);

  if (subjectString === '') {
    return '';
  }

  return words(subjectString).map(lowerCase).join('_');
}

export default snakeCase;