`Run`¶

Executes a system command and returns the exit code.

$ wo 'Run["echo hello"]'
hello
0

$ wo 'Run["exit 0"]'
0

$ wo 'Run["exit 1"]'
256

Pattern Definitions with `SetDelayed`¶

Define a function using pattern matching.

$ wo 'f[x_] := x^2; f[3]'
9

$ wo 'f[x_] := x^2; f[5]'
25

$ wo 'f[x_] := x + 1; f[10]'
11

Optional arguments use the x_:default syntax to provide default values.

$ wo 'f[x_:0] := x + 1; f[]'
1

$ wo 'f[x_:0] := x + 1; f[5]'
6

$ wo 'g[q_List: {}, n_] := {q, n}; g[5]'
{{}, 5}

$ wo 'g[q_List: {}, n_] := {q, n}; g[{1, 2}, 3]'
{{1, 2}, 3}

$ wo 'f[a_:0, b_, c_:99] := {a, b, c}; f[5]'
{0, 5, 99}

$ wo 'f[a_:0, b_, c_:99] := {a, b, c}; f[1, 5]'
{1, 5, 99}

$ wo 'f[a_:0, b_, c_:99] := {a, b, c}; f[1, 5, 10]'
{1, 5, 10}