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Add toLength helper.

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John-David Dalton
2014-03-14 01:25:57 -07:00
parent e0311e1530
commit 85990bbeb3
1 changed files with 27 additions and 9 deletions
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36
lodash.js
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@@ -43,8 +43,9 @@
reInterpolate = /<%=([\s\S]+?)%>/g;
/**
* Used to match ES6 template delimiters
* http://people.mozilla.org/~jorendorff/es6-draft.html#sec-template-literal-lexical-components
* Used to match ES6 template delimiters.
* See the [ES6 spec](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-template-literal-lexical-components)
* for more details.
*/
var reEsTemplate = /\$\{([^\\}]*(?:\\.[^\\}]*)*)\}/g;
@@ -615,6 +616,9 @@
/** Used to restore the original `_` reference in `noConflict` */
var oldDash = context._;
/** Used as the maximum value returned by `toLength` */
var maxSafeInteger = Math.pow(2, 53) - 1;
/** Used to resolve the internal [[Class]] of values */
var toString = objectProto.toString;
@@ -1339,8 +1343,8 @@
iterable = collection,
length = collection ? collection.length : 0;
if (typeof length == 'number' && length > -1) {
length |= 0;
if (typeof length == 'number') {
length = toLength(length);
if (support.unindexedChars && isString(iterable)) {
iterable = iterable.split('');
}
@@ -1368,8 +1372,8 @@
var iterable = collection,
length = collection ? collection.length : 0;
if (typeof length == 'number' && length > -1) {
length = (length |= 0) < 0 ? 0 : length;
if (typeof length == 'number') {
length = toLength(length);
if (support.unindexedChars && isString(iterable)) {
iterable = iterable.split('');
}
@@ -2201,6 +2205,20 @@
return result;
}
/**
* Converts `value` to an integer suitable for use as the length of an array-like
* object. See the [ES6 spec](http://people.mozilla.org/~jorendorff/es6-draft.html#sec-tolength)
* for more details.
*
* @private
* @param {*} value The value to convert.
* @returns {number} Returns the converted integer.
*/
function toLength(value) {
var result = +value || 0;
return result < 0 ? 0 : (result < maxSafeInteger ? result : maxSafeInteger);
}
/*--------------------------------------------------------------------------*/
/**
@@ -3555,7 +3573,7 @@
* // => true
*/
function contains(collection, target, fromIndex) {
var length = (length = collection && collection.length, length > -1 && length >>> 0);
var length = toLength(collection && collection.length);
fromIndex = (typeof fromIndex == 'number' && +fromIndex) || 0;
if (length) {
@@ -4452,7 +4470,7 @@
collection = collection.split('');
}
if (n == null || guard) {
var length = (length = collection && collection.length, length > -1 && length >>> 0);
var length = toLength(collection && collection.length);
return length > 0 ? collection[baseRandom(0, length - 1)] : undefined;
}
var result = shuffle(collection);
@@ -7856,7 +7874,7 @@
* @category Utilities
* @param {string} value The value to parse.
* @param {number} [radix] The radix used to interpret the value to parse.
* @returns {number} Returns the converted integer value.
* @returns {number} Returns the converted integer.
* @example
*
* _.parseInt('08');