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46 lines
923 B
46 lines
923 B
/**
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* @author Titus Wormer
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* @copyright 2015 Titus Wormer
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* @license MIT
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* @module ccount
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* @fileoverview Count characters.
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*/
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'use strict';
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/* Expose. */
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module.exports = ccount;
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/**
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* Count how many characters `character` occur in `value`.
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*
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* @example
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* ccount('foo(bar(baz)', '(') // 2
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* ccount('foo(bar(baz)', ')') // 1
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*
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* @param {string} value - Content, coerced to string.
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* @param {string} character - Single character to look
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* for.
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* @return {number} - Count.
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* @throws {Error} - when `character` is not a single
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* character.
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*/
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function ccount(value, character) {
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var count = 0;
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var index;
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value = String(value);
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if (typeof character !== 'string' || character.length !== 1) {
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throw new Error('Expected character');
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}
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index = value.indexOf(character);
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while (index !== -1) {
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count++;
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index = value.indexOf(character, index + 1);
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}
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return count;
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}
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