joinElement method
Implementation
List<T> joinElement(T separator) {
if (length >= 2) {
var tar = length - 1;
for (var i = 0; i < tar; i++) {
insert(1 + 2 * i, separator);
}
}
return this;
}
List<T> joinElement(T separator) {
if (length >= 2) {
var tar = length - 1;
for (var i = 0; i < tar; i++) {
insert(1 + 2 * i, separator);
}
}
return this;
}