just like that

The idiom just like that is often used to describe a sudden or unexpected action or change. Someone might say "He quit his job just like that" to convey that the person made the decision abruptly and without any prior warning or consideration. This idiom can also be used to describe a task or action that was completed effortlessly or with minimal effort. For instance, someone might say "I fixed the broken appliance just like that" to emphasize that the task was completed easily and without much difficulty.

One of the related idioms to just like that is "in a flash". This idiom is used in similar contexts to indicate that something happened very quickly or instantaneously. It can be used to describe actions or events that occur suddenly or unexpectedly, just like that. For example, someone might say "The car disappeared in a flash" to convey that the car vanished quickly and without warning.

"At the drop of a hat" is another idiomatic expression that relates to just like that. This phrase is used to indicate that something happens immediately or without hesitation. It can be used to describe actions or decisions that are made quickly and without any delay. For example, someone might say "He would jump at the opportunity at the drop of a hat" to convey that he would take advantage of the opportunity immediately and without hesitation.

Lastly, there is the idiom "in one foul swoop". This phrase is used to describe a single action or event that has sweeping or comprehensive effects. It can be used to emphasize the scale or impact of an action or change. For instance, someone might say "She rearranged the entire office in one foul swoop" to convey that she made significant changes to the office all at once and with drastic effects.