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Command Reference: left

Left substring every item in a list

Description

Takes a list from STDIN and returns a left substring of that same list.

One parameter is required and that is the number of characters to return. If the parameter is a negative then left counts from the right.

Usage

<stdin> -> left int -> <stdout>

Examples

Count from the left

» ja: [Monday..Wednesday] -> left 2
[
    "Mo",
    "Tu",
    "We"
]

Count from the right

» ja: [Monday..Wednesday] -> left -3
[
    "Mon",
    "Tues",
    "Wednes"
]

Detail

Supported data types can queried via runtime

runtime: --marshallers
runtime: --unmarshallers

See Also

• commands/a (mkarray): A sophisticated yet simple way to build an array or list
• commands/ja: A sophisticated yet simply way to build a JSON array
• apis/lang.MarshalData() (system API): Converts structured memory into a murex data-type (eg for stdio)
• apis/lang.UnmarshalData() (system API): Converts a murex data-type into structured memory
• commands/len: Outputs the length of an array
• commands/prefix: Prefix a string to every item in a list
• commands/right: Right substring every item in a list
• commands/runtime: Returns runtime information on the internal state of murex
• commands/suffix: Prefix a string to every item in a list