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More pad optimizations.

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This commit is contained in:
John-David Dalton
2016-03-27 12:37:09 -07:00
parent b1d7450052
commit 75727d073b
1 changed files with 17 additions and 18 deletions
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35
lodash.js
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@@ -4622,21 +4622,13 @@
* is truncated if the number of characters exceeds `length`. * is truncated if the number of characters exceeds `length`.
* *
* @private * @private
* @param {string} string The string to create padding for. * @param {number} length The padding length.
* @param {number} [length=0] The padding length.
* @param {string} [chars=' '] The string used as padding. * @param {string} [chars=' '] The string used as padding.
* @returns {string} Returns the padding for `string`. * @returns {string} Returns the padding for `string`.
*/ */
function createPadding(string, length, chars) { function createPadding(length, chars) {
length = toInteger(length);
var strLength = length ? stringSize(string) : 0;
if (!length || strLength >= length) {
return '';
}
chars = chars === undefined ? ' ' : (chars + ''); chars = chars === undefined ? ' ' : (chars + '');
chars = chars == '' ? ' ' : chars; chars = chars == '' ? ' ' : chars;
length -= strLength;
var charsLength = chars.length; var charsLength = chars.length;
if (charsLength == 1) { if (charsLength == 1) {
@@ -13274,14 +13266,11 @@
if (!length || strLength >= length) { if (!length || strLength >= length) {
return string; return string;
} }
var mid = (length - strLength) / 2, var mid = (length - strLength) / 2;
leftLength = nativeFloor(mid),
rightLength = nativeCeil(mid);
return ( return (
createPadding('', leftLength, chars) + createPadding(nativeFloor(mid), chars) +
string + string +
createPadding('', rightLength, chars) createPadding(nativeCeil(mid), chars)
); );
} }
@@ -13310,7 +13299,12 @@
*/ */
function padEnd(string, length, chars) { function padEnd(string, length, chars) {
string = toString(string); string = toString(string);
return string + createPadding(string, length, chars); length = toInteger(length);
var strLength = length ? stringSize(string) : 0;
return (length && strLength < length)
? (string + createPadding(length - strLength, chars))
: string;
} }
/** /**
@@ -13338,7 +13332,12 @@
*/ */
function padStart(string, length, chars) { function padStart(string, length, chars) {
string = toString(string); string = toString(string);
return createPadding(string, length, chars) + string; length = toInteger(length);
var strLength = length ? stringSize(string) : 0;
return (length && strLength < length)
? (createPadding(length - strLength, chars) + string)
: string;
} }
/** /**