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var baseToString = require('../internal/baseToString'),
createPadding = require('../internal/createPadding');
/** Native method references. */
var ceil = Math.ceil,
floor = Math.floor;
/* Native method references for those with the same name as other `lodash` methods. */
var nativeIsFinite = global.isFinite;
/**
* Pads `string` on the left and right sides if it is shorter than `length`.
* Padding characters are truncated if they can't be evenly divided by `length`.
*
* @static
* @memberOf _
* @category String
* @param {string} [string=''] The string to pad.
* @param {number} [length=0] The padding length.
* @param {string} [chars=' '] The string used as padding.
* @returns {string} Returns the padded string.
* @example
*
* _.pad('abc', 8);
* // => ' abc '
*
* _.pad('abc', 8, '_-');
* // => '_-abc_-_'
*
* _.pad('abc', 3);
* // => 'abc'
*/
function pad(string, length, chars) {
string = baseToString(string);
length = +length;
var strLength = string.length;
if (strLength >= length || !nativeIsFinite(length)) {
return string;
}
var mid = (length - strLength) / 2,
leftLength = floor(mid),
rightLength = ceil(mid);
chars = createPadding('', rightLength, chars);
return chars.slice(0, leftLength) + string + chars;
}
module.exports = pad;
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