elif

Adds an else-if branch after a previous if branch.

Aliases: else if

Syntax: elif <condition> <block>

Category#

control-flow

Related#

• if
• else

Examples#

radix/corpus/si/sin.fab (canonical · keyword)#

Adds an else-if branch after a previous if branch.

# =============================================================================
# elif — Adds an else-if branch after a previous if branch.
# =============================================================================
#
# What this teaches:
#   • Else-if chains — `elif <condition> { body }` adds intermediate conditional
#     branches between `if` and `else`
#   • First match wins: evaluation stops at the first `if` or `elif` whose
#     condition is `true`
#
# Common mistakes:
#   • TODO: forgetting that `elif` blocks are skipped once a preceding branch
#     matches
#
# See also: if, else
# =============================================================================

# si-sin-secus (poetic if-else-if chain)
#
# if <cond> { }
# elif <cond> { }
# else { }
#
# GRAMMAR:
#   ifStmt :← 'if' expr block ('elif' expr block)* ('else' block)?
#
# EXPECTED OUTPUT:
#   Afternoon (hour=14 matches first elif branch).

main {
    const int hour ← 14
    if hour ≺ 6 {
        print "Late night"
    }
    elif hour ≺ 12 {
        print "Morning"
    }
    elif hour ≺ 18 {
        # 14 ≥ 12 and 14 < 18
        print "Afternoon"
    }
    elif hour ≺ 22 {
        print "Evening"
    }
    else {
        print "Night"
    }
}

Expected output:

Afternoon

radix/corpus/sin/sin.fab (canonical · keyword)#

Adds an else-if branch after a previous if branch.

# =============================================================================
# elif — Adds an else-if branch after a previous if branch.
# =============================================================================
#
# What this teaches:
#   • Standalone else-if — `elif` provides an intermediate conditional branch
#     evaluated only when the preceding `if` condition was `false`
#   • Chains: `if { } elif { } else { }` for multi-way branching
#
# Common mistakes:
#   • Writing `else if` instead of the canonical `elif` for else-if branches.
#
# See also: if, else
# =============================================================================

# elif — else-if branch
#
# GRAMMAR:
#   elseIfClause :← 'elif' expr block
#
# EXPECTED OUTPUT:
#   Scalar stdout smoke (see body).
#
# BACKEND:
#   Cross-ref: if/sin.fab.
#

main {
    const int score ← 85
    if score ≥ 90 {
        print "excellent"
    }
    elif score ≥ 80 {
        print "good"
    }
    else {
        print "needs work"
    }
}

Expected output:

good