# The `if` statement

## With one branch: Executes the branch depending on the condition

### Juttle

    function f(x) {
      if (x) {
        return 1;
      }

      return null;
    }

    emit -from Date.new(0) -limit 1
      | put f = f(false)
      | put t = f(true)
      | view result

### Output

    { "time": "1970-01-01T00:00:00.000Z", f: null, t: 1 }

## With two branches: Executes one of the branches depending on the condition

### Juttle

    function f(x) {
      if (x) {
        return 1;
      } else {
        return 0;
      }
    }

    emit -from Date.new(0) -limit 1
      | put f = f(false)
      | put t = f(true)
      | view result

### Output

    { "time": "1970-01-01T00:00:00.000Z", f: 0, t: 1 }

## Produces an error when used with a condition of invalid type

### Juttle

    function f(x) {
      if (x) {
        return 1;
      } else {
        return 0;
      }
    }

    emit -from Date.new(0) -limit 1 | put result = f(null) | view result

### Warnings

  * if statement: Invalid condition type (null).