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Array.prototype.toString = function() {
var r = "["
for (var idx = 0; idx < this.length; idx = idx + 1) {
if (idx > 0)
r = r + ", "
r = r + this[idx].toString()
}
return r + "]"
}
Array.prototype.push = function(x) {
this[this.length] = x
this.length = this.length + 1
return x
}
Array.prototype.pop = function() {
var r = this[this.length - 1]
this[this.length - 1] = undefined
this.length = this.length - 1
return r
}
Array.prototype.join = function(delim) {
var r = ""
for (var idx = 0; idx < this.length; idx++) {
if (idx > 0)
r += delim
r += this[idx]
}
return r
}
Array.prototype.concat = function(xs) {
for (var idx = 0; idx < xs.length; idx++)
this.push(xs[idx])
return this
}