通常，Arrays用于两种数据结构：queue和stack。 要了解什么queue是食品，您可以想象在食品商店中有一个普通的队列：新人们在队列的末端加入队列，而刚开始的人们则先离开队列。这就是为什么我们需要两种方法来实现的原因queue：一种在的末尾添加元素，Array而另一种在的开始处删除元素的方法queue。这两种方法是push()将一个或多个元素添加到数组的末尾并返回新的数组长度，并shift()删除数组的第零个元素并返回其值：

The slice() method works only with arrays whose elements are strings, numbers, or boolean values.

Indexes can also be negative. If you specify a negative index in the first parameter, it will shift the end of the sequence. For example, slice(-4) call will extract the last four elements of the sequence:

The slice() method does not change the source array, but returns a copy of the array

function foo { local -n data_ref=$1 echo ${data_ref[a]} ${data_ref[b]} } declare -A data data[a]="Fred Flintstone" data[b]="Barney Rubble" foo data

head(as.data.frame(nasa))#> lat long month year cloudhigh cloudlow cloudmid ozone pressure #> 1 36.20000 -113.8 1 1995 26.0 7.5 34.5 304 835 #> 2 33.70435 -113.8 1 1995 20.0 11.5 32.5 304 940 #> 3 31.20870 -113.8 1 1995 16.0 16.5 26.0 298 960 #> 4 28.71304 -113.8 1 1995 13.0 20.5 14.5 276 990 #> 5 26.21739 -113.8 1 1995 7.5 26.0 10.5 274 1000 #> 6 23.72174 -113.8 1 1995 8.0 30.0 9.5 264 1000 #> surftemp temperature #> 1 272.7 272.1 #> 2 279.5 282.2 #> 3 284.7 285.2 #> 4 289.3 290.7 #> 5 292.2 292.7 #> 6 294.1 293.6

const list = [].concat(x);

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The current algorithms in the JSON-LD spec do not support the conversion of list of lists to JSON-LD. This is a "Feature at risk" [1].