inventory_set()

Syntax

inventory_set(inventory, slot, count, item, nbt)

Modifies or sets a stack in inventory. specify count 0 to empty the slot. If item is not specified, keeps existing item, just modifies the count. If item is provided - replaces current item. If nbt is provided - adds a tag to the stack at slot. Returns previous stack in that slot.

inventory_set(player(), 0, 0) => ['stone', 64, {}] // player had a stack of stone in first hotbar slot
inventory_set(player(), 0, 6) => ['diamond', 64, {}] // changed stack of diamonds in player slot to 6
inventory_set(player(), 0, 1, 'diamond_axe','{Damage:5}') => null //added slightly damaged diamond axe to first player slot