Inserts an element between each pair of elements.
Riffle[{e1, e2, …}, x]
Riffle[{e1, e2, …}, {x1, x2, …}]
Riffle[list, x, n]
Riffle[list, x, {imin, imax, n}]
Riffle[{a, b, c}, x]
→ {a, x, b, x, c}Riffle[{1, 2, 3, 4}, 0]
→ {1, 0, 2, 0, 3, 0, 4}Riffle[{a}, x]
→ {a}Riffle[{}, x]
→ {}Riffle[{a, b, c, d}, {1, 2, 3, 4}]
→ {a, 1, b, 2, c, 3, d, 4}Riffle[{a, b, c}, {1, 2}]
→ {a, 1, b, 2, c}