Sha256: 3f53f00b525f6df29ae6dc0cceaa2fbf396d4c545f779091420d1b099b46d1d3
Contents?: true
Size: 1.67 KB
Versions: 5
Compression:
Stored size: 1.67 KB
Contents
var _ = require('../util')
var arrayProto = Array.prototype
var arrayMethods = Object.create(arrayProto)
/**
* Intercept mutating methods and emit events
*/
;[
'push',
'pop',
'shift',
'unshift',
'splice',
'sort',
'reverse'
]
.forEach(function (method) {
// cache original method
var original = arrayProto[method]
_.define(arrayMethods, method, function mutator () {
// avoid leaking arguments:
// http://jsperf.com/closure-with-arguments
var i = arguments.length
var args = new Array(i)
while (i--) {
args[i] = arguments[i]
}
var result = original.apply(this, args)
var ob = this.__ob__
var inserted
switch (method) {
case 'push':
inserted = args
break
case 'unshift':
inserted = args
break
case 'splice':
inserted = args.slice(2)
break
}
if (inserted) ob.observeArray(inserted)
// notify change
ob.notify()
return result
})
})
/**
* Swap the element at the given index with a new value
* and emits corresponding event.
*
* @param {Number} index
* @param {*} val
* @return {*} - replaced element
*/
_.define(
arrayProto,
'$set',
function $set (index, val) {
if (index >= this.length) {
this.length = index + 1
}
return this.splice(index, 1, val)[0]
}
)
/**
* Convenience method to remove the element at given index.
*
* @param {Number} index
* @param {*} val
*/
_.define(
arrayProto,
'$remove',
function $remove (index) {
if (typeof index !== 'number') {
index = this.indexOf(index)
}
if (index > -1) {
return this.splice(index, 1)[0]
}
}
)
module.exports = arrayMethods
Version data entries
5 entries across 5 versions & 1 rubygems