index.md

---

title: Absolute
slug: WebAssembly/Reference/Numeric/Absolute

---

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The abs instructions, short for absolute, are used to get the absolute value of a number. That is, it returns x if x is positive, and the negation of x if x is negative.

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Syntax

;; load a number onto the stack
f32.const -2

;; absolute
f32.abs

;; the top item on the stack will now be 2

Instruction	Binary opcode
f32.abs	0x8b
f64.abs	0x99