'use strict';

/**
 * @param {number}
 * @return {number}
 */
var abs = Math.abs;

/**
 * @param {number}
 * @return {string}
 */
var from = String.fromCharCode;

/**
 * @param {object}
 * @return {object}
 */
var assign = Object.assign;

/**
 * @param {string} value
 * @param {number} length
 * @return {number}
 */
function hash (value, length) {
	return charat(value, 0) ^ 45 ? (((((((length << 2) ^ charat(value, 0)) << 2) ^ charat(value, 1)) << 2) ^ charat(value, 2)) << 2) ^ charat(value, 3) : 0
}

/**
 * @param {string} value
 * @return {string}
 */
function trim (value) {
	return value.trim()
}

/**
 * @param {string} value
 * @param {RegExp} pattern
 * @return {string?}
 */
function match (value, pattern) {
	return (value = pattern.exec(value)) ? value[0] : value
}

/**
 * @param {string} value
 * @param {(string|RegExp)} pattern
 * @param {string} replacement
 * @return {string}
 */
function replace (value, pattern, replacement) {
	return value.replace(pattern, replacement)
}

/**
 * @param {string} value
 * @param {string} search
 * @return {number}
 */
function indexof (value, search) {
	return value.indexOf(search)
}

/**
 * @param {string} value
 * @param {number} index
 * @return {number}
 */
function charat (value, index) {
	return value.charCodeAt(index) | 0
}

/**
 * @param {string} value
 * @param {number} begin
 * @param {number} end
 * @return {string}
 */
function substr (value, begin, end) {
	return value.slice(begin, end)
}

/**
 * @param {string} value
 * @return {number}
 */
function strlen (value) {
	return value.length
}

/**
 * @param {any[]} value
 * @return {number}
 */
function sizeof (value) {
	return value.length
}

/**
 * @param {any} value
 * @param {any[]} array
 * @return {any}
 */
function append (value, array) {
	return array.push(value), value
}

/**
 * @param {string[]} array
 * @param {function} callback
 * @return {string}
 */
function combine (array, callback) {
	return array.map(callback).join('')
}

exports.abs = abs;
exports.append = append;
exports.assign = assign;
exports.charat = charat;
exports.combine = combine;
exports.from = from;
exports.hash = hash;
exports.indexof = indexof;
exports.match = match;
exports.replace = replace;
exports.sizeof = sizeof;
exports.strlen = strlen;
exports.substr = substr;
exports.trim = trim;
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