all.md

all?

Returns true if all the elements in a collection return true for the given function.

all? [ 1, 2, 3 ]
  def elt \ elt > 0
    #
    # yields true

all? [ 1, 2, 3 ]
  def elt \ elt > 2
    #
    # yields false

all? { a: 'A', b: 'B' }
  def key, val \ val == 'A' or val == 'B'
    #
    # yields true

without a function

For an array, yields true if all the elements are "trueish" (not nil, not false).

all? []                            # yields true
all? [ 1 2 3 ]                     # yields true
all? [ 1 false 3 ]                 # yields false

For an object, yields true if all the values are trueish.

all? {}                            # yields true
all? { a: 'A', b: 'B', c: 'C' }    # yields true
all? { a: 'A', f: false, c: 'C' }  # yields false

incoming ret

[]
all?  # yields true
[ 1 2 3 ]
all?  # yields true
[ 1 false 3 ]
all?  # yields false

iterating and functions

Iterating functions accept 0 to 3 arguments when iterating over an array and 0 to 4 arguments when iterating over an object.

Those arguments are [ value, index, length ] for arrays. They are [ key, value, index, length ] for objects.

The corresponding key, val, idx and len variables are also set in the closure for the function call.

see also

Any?

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