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Object.is(): special cases NaN and negative zero
The comparison has small but important differences compared with ===.
Published22 Oct 2026
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Object.freeze(): locked container, not locked nested content
Freezing is not automatically recursive.
Published22 Oct 2026
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Object.assign(): later source can overwrite field
The operation changes the target object and copies shallowly.
Published22 Oct 2026
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Object.hasOwn(): existing field with undefined
The presence of a property is different from the presence of a useful value.
Published22 Oct 2026
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Object.values(): values without their names
When converting, the direct connection to the keys in the received array is lost.
Published22 Oct 2026
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Object.keys(): names of own enumerable properties
Inherited properties do not automatically enter the list.
Published22 Oct 2026
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Math.hypot(): distance from perpendicular components
The function calculates the root of the sum of the squares.
Published22 Oct 2026
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Math.random(): random selection for a game, not a secret
The pseudo-random result is in the range of 0 including to 1 exclusively.
Published22 Oct 2026
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Math.trunc(): fraction removal
For positive and negative numbers, the direction is towards zero.
Published22 Oct 2026
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Math.ceil(): how many whole packs are needed
Rounding up is appropriate when a partial unit cannot be ordered.
Published22 Oct 2026
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Math.floor(): down means to minus infinity
Cutting the fractional part is a different operation for negative numbers.
Published22 Oct 2026
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Math.round(): how the halves behave
At exactly half the difference is in the direction of positive infinity.
Published22 Oct 2026